Slate Star Codex

I.

Imagine a distant planet full of eyeless animals. Evolving eyes is hard: they need to evolve Eye Part 1, then Eye Part 2, then Eye Part 3, in that order. Each of these requires a separate series of rare mutations.

Here on Earth, scientists believe each of these mutations must have had its own benefits – in the land of the blind, the man with only Eye Part 1 is king. But on this hypothetical alien planet, there is no such luck. You need all three Eye Parts or they’re useless. Worse, each Eye Part is metabolically costly; the animal needs to eat 1% more food per Eye Part it has. An animal with a full eye would be much more fit than anything else around, but an animal with only one or two Eye Parts will be at a small disadvantage.

So these animals will only evolve eyes in conditions of relatively weak evolutionary pressure. In a world of intense and perfect competition, where the fittest animal always survives to reproduce and the least fit always dies, the animal with Eye Part 1 will always die – it’s less fit than its fully-eyeless peers. The weaker the competition, and the more randomness dominates over survival-of-the-fittest, the more likely an animal with Eye Part 1 can survive and reproduce long enough to eventually produce a descendant with Eye Part 2, and so on.

There are lots of ways to decrease evolutionary pressure. Maybe natural disasters often decimate the population, dozens of generations are spent recolonizing empty land, and during this period there’s more than enough for everyone and nobody has to compete. Maybe there are frequent whalefalls, and any animal nearby has hit the evolutionary jackpot and will have thousands of descendants. Maybe the population is isolated in little islands and mountain valleys, and one gene or another can reach fixation in a population totally by chance. It doesn’t matter exactly how it happens, it matters that evolutionary pressure is low.

The branch of evolutionary science that deals with this kind of situation is called “adaptive fitness landscapes”. Landscapes really are a great metaphor – consider somewhere like this:

You pour out a bucket of water. Water “flows downhill”, so it’s tempting to say something like “water wants to be at the lowest point possible”. But that’s not quite right. The lowest point possible is the pit, and water won’t go there. It will just sit in the little puddle forever, because it would have to go up the tiny little hillock in order to get to the pit, and water can’t flow uphill. Using normal human logic, we feel tempted to say something like “Come on! The hillock is so tiny, and that pit is so deep, just make a single little exception to your ‘always flow downhill’ policy and you could do so much better for yourself!” But water stubbornly refuses to listen.

Under conditions of perfectly intense competition, evolution works the same way. We imagine a multidimensional evolutionary “landscape” where lower ground represents higher fitness. In this perfectly intense competition, organisms can go from lower to higher fitness, but never vice versa. As with water, the tiniest hillock will leave their potential forever unrealized.

Under more relaxed competition, evolution only tends probabilistically to flow downhill. Every so often, it will flow uphill; the smaller the hillock, the more likely evolution will surmount it. Given enough time, it’s guaranteed to reach the deepest pit and mostly stay there.

Take a moment to be properly amazed by this. It sounds like something out of the Tao Te Ching. An animal with eyes has very high evolutionary fitness. It will win at all its evolutionary competitions. So in order to produce the highest-fitness animal, we need to – select for fitness less hard? In order to produce an animal that wins competitions, we need to stop optimizing for winning competitions?

This doesn’t mean that less competition is always good. An evolutionary environment with no competition won’t evolve eyes either; a few individuals might randomly drift into having eyes, but they won’t catch on. In order to optimize the species as much as possible as fast as possible, you need the right balance, somewhere in the middle between total competition and total absence of competition.

In the esoteric teachings, total competition is called Moloch, and total absence of competition is called Slack. Slack (thanks to Zvi Mowshowitz for the term and concept) gets short shrift. If you think of it as “some people try to win competitions, other people don’t care about winning competitions and slack off and go to the beach”, you’re misunderstanding it. Think of slack as a paradox – the Taoist art of winning competitions by not trying too hard at them. Moloch and Slack are opposites and complements, like yin and yang. Neither is stronger than the other, but their interplay creates the ten thousand things.

II.

Before we discuss slack further, a digression on group selection.

Some people would expect this discussion to be quick, since group selection doesn’t exist. These people understand it as evolution acting for the good of a species. It’s a tempting way to think, because evolution usually eventually makes species stronger and more fit, and sometimes we colloquially round that off to evolution targeting a species’ greater good. But inevitably we find evolution is awful and does absolutely nothing of the sort.

Imagine an alien planet that gets hit with a solar flare once an eon, killing all unshielded animals. Sometimes unshielded animals spontaneously mutate to shielded, and vice versa. Shielded animals are completely immune to solar flares, but have 1% higher metabolic costs. What happens? If you predicted “magnetic shielding reaches fixation and all animals get it”, you’ve fallen into the group selection trap. The unshielded animals outcompete the shielded ones during the long inter-flare period, driving their population down to zero (though a few new shielded ones arise every generation through spontaneous mutations). When the flare comes, only the few spontaneous mutants survive. They breed a new entirely-shielded population, until a few unshielded animals arise through spontaneous mutation. The unshielded outcompete the shielded ones again, and by the time of the next solar flare, the population is 100% unshielded again and they all die. If the animals are lucky, there will always be enough spontaneously-mutated shielded animals to create a post-flare breeding population; if they are unlucky, the flare will hit at a time with unusually few such mutants, and the species will go extinct.

An Evolution Czar concerned with the good of the species would just declare that all animals should be shielded and solve the problem. In the absence of such a Czar, these animals will just keep dying in solar-flare-induced mass extinctions forever, even though there is an easy solution with only 1% metabolic cost.

A less dramatic version of the same problem happens here on Earth. Every so often predators (let’s say foxes) reproduce too quickly and outstrip the available supply of prey (let’s say rabbits). There is a brief period of starvation as foxes can’t find any more rabbits and die en masse. This usually ends with a boom-bust cycle: after most foxes die, the rabbits (who reproduce very quickly and are now free of predation) have a population boom; now there are rabbits everywhere. Eventually the foxes catch up, eat all the new rabbits, and the cycle repeats again. It’s a waste of resources for foxkind to spend so much of time and its energy breeding a huge population of foxes that will inevitably collapse a generation later; an Evolution Czar concerned with the common good would have foxes limit their breeding at a sustainable level. But since individual foxes that breed excessively are more likely to have their genes represented in the next generation than foxes that breed at a sustainable level, we end up with foxes that breed excessively, and the cycle continues.

(but humans are too smart to fall for this one, right?)

Some scientists tried to create group selection under laboratory conditions. They divided some insects into subpopulations, then killed off any subpopulation whose numbers got too high, and “promoted” any subpopulation that kept its numbers low to better conditions. They hoped the insects would evolve to naturally limit their family size in order to keep their subpopulation alive. Instead, the insects became cannibals: they ate other insects’ children so they could have more of their own without the total population going up. In retrospect, this makes perfect sense; an insect with the behavioral program “have many children, and also kill other insects’ children” will have its genes better represented in the next generation than an insect with the program “have few children”.

But sometimes evolution appears to solve group selection problems. What about multicellular life? Stick some cells together in a resource-plentiful environment, and they’ll naturally do the evolutionary competition thing of eating resources as quickly as possible to churn out as many copies of themselves as possible. If you were expecting these cells to form a unitary organism where individual cells do things like become heart cells and just stay in place beating rhythmically, you would call the expected normal behavior “cancer” and be against it. Your opposition would be on firm group selectionist grounds: if any cell becomes cancer, it and its descendants will eventually overwhelm everything, and the organism (including all cells within it, including the cancer cells) will die. So for the good of the group, none of the cells should become cancerous.

The first step in evolution’s solution is giving all cells the same genome; this mostly eliminates the need to compete to give their genes to the next generation. But this solution isn’t perfect; cells can get mutations in the normal course of dividing and doing bodily functions. So it employs a host of other tricks: genetic programs telling cells to self-destruct if they get too cancer-adjacent, an immune system that hunts down and destroys cancer cells, or growing old and dying (this last one isn’t usually thought of as a “trick”, but it absolutely is: if you arrange for a cell line to lose a little information during each mitosis, so that it degrades to the point of gobbledygook after X divisions, this means cancer cells that divide constantly will die very quickly, but normal cells dividing on an approved schedules will last for decades).

Why can evolution “develop tricks” to prevent cancer, but not to prevent foxes from overbreeding, or aliens from losing their solar flare shields? Group selection works when the group itself has a shared genetic code (or other analogous ruleset) that can evolve. It doesn’t work if you expect it to directly change the genetic code of each individual to cooperate more.

When we think of cancer, we are at risk of conflating two genetic codes: the shared genetic code of the multicellular organism, and the genetic code of each cell within the organism. Usually (when there are no mutations in cell divisions) these are the same. Once individual cells within the organism start mutating, they become different. Evolution will select for cancer in changes to individual cells’ genomes over an organism’s lifetime, but select against it in changes to the overarching genome over the lifetime of the species (ie you should expect all the genes you inherited from your parents to be selected against cancer, and all the mutations in individual cells you’ve gotten since then to be selected for cancer).

The fox population has no equivalent of the overarching genome; there is no set of rules that govern the behavior of every fox. So foxes can’t undergo group selection to prevent overpopulation (there are some more complicated dynamics that might still be able to rescue the foxes in some situations, but they’re not relevant to the simple model we’re looking at).

In other words, group selection can happen in a two-layer hierarchy of nested evolutionary systems when the outer system (eg multicellular humans) includes rules that the inner system (eg human cells) have to follow, and where the fitness of the evolving-entities in the outer system depends on some characteristics of the evolving-entities in the inner system (eg humans are higher-fitness if their cells do not become cancerous). The evolution of the outer layer includes includes evolution over rulesets, and eventually evolves good strong rulesets that tell the inner-layer evolving entities how to behave, which can include group selection (eg humans evolve a genetic code that includes a rule “individual cells inside of me should not get cancer” and mechanisms for enforcing this rule).

You can find these kinds of two-layer evolutionary systems everywhere. For example, “cultural evolution” is a two-layer evolutionary system. In the hypothetical state of nature, there’s unrestricted competition – people steal from and murder each other, and only the strongest survive. After they form groups, the groups compete with each other, and groups that develop rulesets that prevent theft and murder (eg legal codes, religions, mores) tend to win those competitions. Once again, the outer layer (competition between cultures) evolves groups that successfully constrains the inner layer (competition between individuals). Species don’t have a czar who restrains internal competition in the interest of keeping the group strong, but some human cultures do (eg Russia).

Or what about market economics? The outer layer is companies, the inner layer is individuals. Maybe the individuals are workers – each worker would selfishly be best off if they spent the day watching YouTube videos and pushed the hard work onto someone else. Or maybe they’re executives – each individual executive would selfishly be best off if they spent their energy on office politics, trying to flatter and network with whoever was most likely to promote them. But if all the employees loaf off and all the executives focus on office politics, the company won’t make products, and competitors will eat their lunch. So someone – maybe the founder/CEO – comes up with a ruleset to incentivize good work, probably some kind of performance review system where people who do good work get promoted and people who do bad work get fired. The outer-layer competition between companies will select for corporations with the best rulesets; over time, companies’ internal politics should get better at promoting the kind of cooperation necessary to succeed.

How do these systems replicate multicellular life’s success without being literal entities with literal DNA having literal sex? They all involve a shared ruleset and a way of punishing rulebreakers which make it in each individual’s short-term interest to follow the ruleset that leads to long-term success. Countries can do that (follow the law or we’ll jail you), companies can do that (follow our policies or we’ll fire you), even multicellular life can sort of do that (don’t become cancer, or immune cells will kill you). When there’s nothing like that (like the overly-fast-breeding foxes) evolution fails at group selection problems. When there is something like that, it has a chance. When there’s something like that, and the thing like that is itself evolving (either because it’s encoded in literal DNA, or because it’s encoded in things like company policies that determine whether a company goes out of business or becomes a model for others), then it can reach a point where it solves group selection problems very effectively.

In the esoteric teachings, the inner layer of two-layer evolutionary systems is represented by the Goddess of Cancer, and outer layer by the Goddess of Everything Else. In each part of the poem, the Goddess of Cancer orders the evolving-entities to compete, but the Goddess of Everything Else recasts it as a two-layer competition where cooperation on the internal layer helps win the competition on the external layer. He who has ears to hear, let him listen.

III.

Why the digression? Because slack is a group selection problem. A species that gave itself slack in its evolutionary competition would do better than one that didn’t – for example, the eyeless aliens would evolve eyes and get a big fitness boost. But no individual can unilaterally choose to compete less intensely; if it did, it would be outcompeted and die. So one-layer evolution will fail at this problem the same way it fails all group selection problems, but two-layer systems will have a chance to escape the trap.

The multicellular life example above is a special case where you want 100% coordination and 0% competition. I framed the other examples the same way – countries do best when their citizens avoid all competition and work together for the common good, companies do best when their executives avoid self-aggrandizing office politics and focus on product quality. But as we saw above, some systems do best somewhere in the middle, where there’s some competition but also some slack.

For example, consider a researcher facing their own version of the eyeless aliens’ dilemma. They can keep going with business as normal – publishing trendy but ultimately useless papers that nobody will remember in ten years. Or they can work on Research Program Part 1, which might lead to Research Program Part 2, which might lead to Research Program Part 3, which might lead to a ground-breaking insight. If their jobs are up for review every year, and a year from now the business-as-normal researcher will have five trendy papers, and the groundbreaking-insight researcher will be halfway through Research Program Part 1, then the business-as-normal researcher will outcompete the groundbreaking-insight researcher; as the saying goes, “publish or perish”. Without slack, no researcher can unilaterally escape the system; their best option will always be to continue business as usual.

But group selection makes the situation less hopeless. Universities have long time-horizons and good incentives; they want to get famous for producing excellent research. Universities have rulesets that bind their individual researchers, for example “after a while good researchers get tenure”. And since universities compete with each other, each is incentivized to come up with the ruleset that maximizes long-term researcher productivity. So if tenure really does work better than constant vicious competition, then (absent the usual culprits like resistance-to-change, weird signaling equilibria, politics, etc) we should expect universities to converge on a tenure system in order to produce the best work. In fact, we should expect universities to evolve a really impressive ruleset for optimizing researcher incentives, just as impressive as the clever mechanisms the human body uses to prevent cancer (since this seems a bit optimistic, I assume the usual culprits are not absent).

The same is true for grant-writing; naively you would want some competition to make sure that only the best grant proposals get funded, but too much competition seems to stifle original research, so much so that some funders are throwing out the whole process and selecting grants by lottery, and others are running grants you can apply for in a half-hour and hear back about two days later. If there’s a feedback mechanism – if these different rulesets produce different-quality research, and grant programs that produce higher-quality research are more likely to get funded in the future – then the rulesets for grants will gradually evolve, and the competition for grants will take place in an environment with whatever the right evolutionary parameters for evolving good research are.

I don’t want to say these things will definitely happen – you can read Inadequate Equilibria for an idea of why not. But they might. The evolutionary dynamics which would normally prevent them can be overcome. Two-layer evolutionary systems can produce their own slack, if having slack would be a good idea.

IV.

That was a lot of paragraphs, and a lot of them started with “imagine a hypothetical situation where…”. Let’s look deeper into cases where an understanding of slack can inform how we think about real-world phenomena. Seven examples:

1. Monopolies. Not the kind that survive off overregulation and patents, the kind that survive by being big enough to crush competitors. These are predators that exploit low-slack environments. If Boeing has a monopoly on building passenger planes, and is exploiting that by making shoddy products and overcharging consumers, then that means anyone else who built a giant airplane factory could make better products at a lower price, capture the whole airplane market, and become a zillionaire. Why don’t they? Slack. In terms of those adaptive fitness landscapes, in between your current position (average Joe) and a much better position at the bottom of a deep pit (you own a giant airplane factor and are a zillionaire), there’s a very big hill you have to climb – the part where you build Giant Airplane Factory Part 1, Giant Airplane Factory Part 2, etc. At each point in this hill, you are worse off than somebody who was not building an as-yet-unprofitable giant airplane factory. If you have infinite slack (maybe you are Jeff Bezos, have unlimited money, and will never go bankrupt no matter how much time and cost it takes before you start earning profits) you’re fine. If you have more limited slack, your slack will run out and you’ll be outcompeted before you make it to the greater-fitness deep pit.

Real monopolies are more complicated than this, because Boeing can shape up and cut prices when you’re halfway to building your giant airplane factory, thus removing your incentive. Or they can do actually shady stuff. But none of this would matter if you already had your giant airplane factory fully built and ready to go – at worst, you and Boeing would then be in a fair fight. Everything Boeing does to try to prevent you from building that factory is exploiting your slacklessness and trying to increase the height of that hill you have to climb before the really deep pit.

(Peter Thiel inverts the landscape metaphor and calls the hill a “moat”, but he’s getting at the same concept).

2. Tariffs. Same story. Here’s the way I understand the history of the international auto industry – anyone who knows more can correct me if I’m wrong. Automobiles were invented in the early 20th century. Several Western countries developed homegrown auto industries more or less simultaneously, with the most impressive being Henry Ford’s work on mass production in the US. Post-WWII Japan realized that its own auto industry would never be able to compete with more established Western companies, so it placed high tariffs on foreign cars, giving local companies like Nissan and Toyota a chance to get their act together. These companies, especially Toyota, invented a new form of auto production which was actually much more efficient than the usual American methods, and were eventually able to hold their own. They started exporting cars to the US; although American tariffs put them at a disadvantage, they were so much better than the American cars of the time that consumers preferred them anyway. After decades of losing out, the American companies adopted a more Japanese ethos, and were eventually able to compete on a level playing field again.

This is a story of things gone surprisingly right – Americans and Japanese alike were able to get excellent inexpensive cars. Two things had to happen for it to work. First, Japan had to have high enough tariffs to give their companies some slack – to let them develop their own homegrown methods from scratch without being immediately outcompeted by temporarily-superior American competitors. Second, America had to have low enough tariffs that eventually-superior Japanese companies could outcompete American automakers, and Japan’s fitness-improving innovations could spread.

From the perspective of a Toyota manager, this is analogous to the eyeless alien story. You start with some good-enough standard (blind animals, American car companies). You want to evolve a superior end product (eye-having animals, Toyota). The intermediate steps (an animal with only Eye Part 1, a kind of crappy car company that stumbles over itself trying out new things) are less fit than the good-enough standard. Only when the inferior intermediate steps are protected from competition (through evolutionary randomness, through tariffs) can the superior end product come into existence. But you want to keep enough competition that the superior end product can use its superiority to spread (there is enough evolutionary competition that having eyes reaches fixation, there is enough free trade that Americans preferentially buy Toyota and US car companies have to adopt its policies).

From the perspective of an economic historian, maybe it’s a group selection story. The various stakeholders in the US auto industry – Ford, GM, suppliers, the government, labor, customers – competed with each other in a certain way and struck some compromise. The various stakeholders in the Japanese auto industry did the same. For some reason the American compromise worked worse than the Japanese one – I’ve heard stories about how US companies were more willing to defraud consumers for short-term profit, how US labor unions were more willing to demand concessions even at the cost of company efficiency, how regulators and executives were in bed with each other to the detriment of the product, etc. Every US interest group was acting in its own short-term self-interest, but the Japanese industry-as-a-whole outcompeted the American one and the Americans had to adjust.

3. Monopolies, Part II. Traditionally, monopolies have been among the most successful R&D centers. The most famous example is Xerox; it had a monopoly on photocopiers for a few decades before losing an anti-trust suit in the late 1970s; during that period, its PARC R&D program invented “laser printing, Ethernet, the modern personal computer, graphical user interface (GUI) and desktop paradigm, object-oriented programming, [and] the mouse”. The second most famous example is Bell Labs, which invented “radio astronomy, the transistor, the laser, the photovoltaic cell, the charge-coupled device, information theory, the Unix operating system, and the programming languages B, C, C++, and S” before the government broke up its parent company AT&T. Google seems to be trying something similar, though it’s too soon to judge their outcomes.

These successes make sense. Research and development is a long-term gamble. Devoting more money to R&D decreases your near-term profits, but (hopefully) increases your future profits. Freed from competition, monopolies have limitless slack, and can afford to invest in projects that won’t pay off for ten or twenty years. This is part of Peter Thiel’s defense of monopolies in Zero To One.

An administrator tasked with advancing technology might be tempted to encourage monopolies in order to get more research done. But monopolies can also be stagnant and resistant to change; it’s probably not a coincidence that Xerox wasn’t the first company to bring the personal computer to market, and ended up irrelevant to the computing revolution. Like the eyeless aliens, who will not evolve in conditions of perfect competition or perfect lack of competition, probably all you can do here is strike a balance. Some Communist countries tried the extreme solution – one state-supported monopoly per industry – and it failed the test of group selection. I don’t know enough to have an opinion on whether countries with strong antitrust eventually outcompete those with weaker antitrust or vice versa.

4. Strategy Games. I like the strategy game Civilization, where you play as a group of primitives setting out to found a empire. You build cities and infrastructure, research technologies, and fight wars. Your world is filled with several (usually 2 to 7) other civilizations trying to do the same.

Just like in the real world, civilizations must decide between Guns and Butter. The Civ version of Guns is called the Axe Rush. You immediately devote all your research to discovering how to make really good axes, all your industry to manufacturing those axes, and all your population into wielding those axes. Then you go and hack everyone else to pieces while they’re still futzing about trying to invent pottery or something.

The Civ version of Butter is called Build. You devote all your research, industry, and populace to laying the foundations of a balanced economy and culture. You invent pottery and weaving and stuff like that. Soon you have a thriving trade network and a strong philosophical tradition. Eventually you can field larger and more advanced armies than your neighbors, and leverage the advantage into even more prosperity, or into military conquest.

Consider a very simple scenario: a map of Eurasia with two civilizations, Rome and China.

If both choose Axe Rush, then whoever Axe Rushes better wins.

If both choose Build, then whoever Builds better wins.

What if Rome chooses Axe Rush, and China chooses Build?

Then it depends on their distance! If it’s a very small map and they start very close together, Rome will probably overwhelm the Chinese before Build starts paying off. But if it’s a very big map, by the time Roman Axemen trek all the way to China, China will have Built high walls, discovered longbows and other defensive technologies, and generally become too strong for axes to defeat. Then they can crush the Romans – who are still just axe-wielding primitives – at their leisure.

Consider a more complicated scenario. You have a map of Earth. The Old World contains Rome and China. The New World contains Aztecs. Rome and China are very close to each other. Now what happens?

Rome and China spend the Stone, Bronze, and Iron Ages hacking each other to bits. Aztecs spend those Ages building cities, researching technologies, and building unique Wonders of the World that provide powerful bonuses. In 1492, they discover Galleons and start crossing the ocean. The powerful and advanced Aztec empire crushes the exhausted axe-wielding Romans and Chinese.

This is another story about slack. The Aztecs had it – they were under no competitive pressure to do things that paid off next turn. The Romans and Chinese didn’t – they had to be at the top of their game every single turn, or their neighbor would conquer them. If there was an option that made you 10% weaker next turn in exchange for making you 100% stronger ten turns down the line, the Aztecs could take it without a second thought; the Romans and Chinese would probably have to pass.

Okay, more complicated Civilization scenario. This time there are two Old World civs, Rome and China, and two New World civs, Aztecs and Inca. The map is stretched a little bit so that all four civilizations have the same amount of natural territory. All four players understand the map layout and can communicate with each other. What happens?

Now it’s a group selection problem. A skillful Rome player will private message the China player and explain all of this to her. She’ll remind him that if one hemisphere spends the whole Stone Age fighting, and the other spends it building, the builders will win. She might tell him that she knows the Aztec and Inca players, they’re smart, and they’re going to be discussing the same considerations. So it would benefit both Rome and China to sign a peace treaty dividing the Old World in two, stick to their own side, and Build. If both sides cooperate, they’ll both Build strong empires capable of matching the New World players. If one side cooperates and the other defects, it will easily steamroll over its unprepared opponent and conquer the whole Old World. If both sides defect, they’ll hack each other to death with axes and be easy prey for the New Worlders.

This might be true in Civilization games, but real-world civilizations are more complicated. Orson Welles said:

In Italy, for thirty years under the Borgias, they had warfare, terror, murder and bloodshed, but they produced Michelangelo, Leonardo da Vinci and the Renaissance. In Switzerland, they had brotherly love, they had five hundred years of democracy and peace – and what did that produce? The cuckoo clock.

So maybe a little bit of internal conflict is good, to keep you honest. Too much conflict, and you tear yourselves apart and are easy prey for outsiders. Too little conflict, and you invent the cuckoo clock and nothing else. The continent that conquers the world will have enough pressure that its people want to innovate, and enough slack that they’re able to.

This is total ungrounded amateur historical speculation, but when I hear that I think of the Classical world. We can imagine it as divided into a certain number of “theaters of civilization” – Greece, Mesopotamia, Egypt, Persia, India, Scythia, etc. Each theater had its own rules governing average state size, the rules of engagement between states, how often bigger states conquered smaller states, how often ideas spread between states of the same size, etc. Some of those theaters were intensely competitive: Egypt was a nice straight line, very suited to centralized rule. Others had more slack: it was really hard to take over all of Greece; even the Spartans didn’t manage. Each theater conducted its own “evolution” in its own way – Egypt was ruled by a single Pharaoh without much competition, Scythia was constant warfare of all against all, Greece was isolated city-states that fought each other sometimes but also had enough slack to develop philosophy and science. Each of those systems did their own thing for a while, until finally one of them produced something perfect: 4th century BC Macedonia. Then it went out and conquered everything.

If Welles is right, the point isn’t to find the ruleset that promotes 100% cooperation. It’s to find the ruleset that promotes an evolutionary system that makes your group the strongest. Usually this involves some amount of competition – in order to select for stronger organisms – but also some amount of slack – to let organisms develop complicated strategies that can make them stronger. Despite the earlier description, this isn’t necessarily a slider between 0% competition and 100% competition. It could be much more complicated – maybe alternating high-slack vs. low-slack periods, or many semi-isolated populations with a small chance of interaction each generation, or alternation between periods of isolation and periods of churning.

In a full two-layer evolution, you would let the systems evolve until they reached the best parameters. Here we can’t do that – Greece has however many mountains it has; its success does not cause the rest of the world to grow more mountains. Still, we randomly started with enough different groups that we got to learn something interesting.

(I can’t emphasize enough how ungrounded this historical speculation is. Please don’t try to evolve Alexander the Great in your basement and then get angry at me when it doesn’t work)

5. The Long-Term Stock Exchange. Actually, all stock exchanges are about slack. Imagine you are a brilliant inventor who, given $10 million and ten years, could invent fusion power. But in fact you have $10 and need work tomorrow or you will starve. Given those constraints, maybe you could start, I don’t know, a lemonade stand.

You’re in the same position as the animal trying to evolve an eye – you could create something very high-utility, if only you had enough slack to make it happen. But by default, the inventor working on fusion power starves to death tomorrow (or at least makes less money than his counterpart who ran the lemonade stand), the same way the animal who evolves Eye Part 1 gets outcompeted by other animals who didn’t and dies out.

You need slack. In the evolution example, animals usually stumble across slack randomly. You too might stumble across slack randomly – maybe it so happens that you are independently wealthy, or won the lottery, or something.

More likely, you use the investment system. You ask rich people to give you $10 million for ten years so you can invent fusion; once you do, you’ll make trillions of dollars and share some of it with them.

This is a great system. There’s no evolutionary equivalent. An animal can’t pitch Darwin on its three-step plan to evolve eyes and get free food and mating opportunities to make it happen. Wall Street is a giant multi-trillion dollar time machine funneling future profits back into the past, and that gives people the slack they need to make the future profits happen at all.

But the Long-Term Stock Exchange is especially about slack. They are a new exchange (approved by the SEC last year) which has complicated rules about who can list with them. Investors will get extra clout by agreeing to hold stocks for a long time; executives will get incentivized to do well in the far future instead of at the next quarterly earnings report. It’s making a deliberate choice to give companies more slack than the regular system and see what they do with it. I don’t know enough about investing to have an opinion, except that I appreciate the experiment. Presumably its companies will do better/worse than companies on the regular stock exchange, that will cause companies to flock toward/away from it, and we’ll learn that its new ruleset is better/worse at evolving good companies through competition than the regular stock exchange’s ruleset.

6. That Time Ayn Rand Destroyed Sears. Or at least that’s how Michael Rozworski and Leigh Phillips describe Eddie Lampert’s corporate reorganization in How Ayn Rand Destroyed Sears, which I recommend. Lampert was a Sears CEO who figured – since free-market competitive economies outcompete top-down economies, shouldn’t free-market competitive companies outcompete top-down companies? He reorganized Sears as a set of competing departments that traded with each other on normal free-market principles; if the Product Department wanted its products marketed, it would have to pay the Marketing Department. This worked really badly, and was one of the main contributors to Sears’ implosion.

I don’t have a great understanding of exactly why Lampert’s Sears lost to other companies even though capitalist economies beat socialist ones; Rozworski and Phillips’ People’s Republic Of Wal-Mart, which looks into this question, is somewhere on my reading list. But even without complete understanding, we can use group selection to evolve the right parameters. Imagine an economy with several businesses. One is a straw-man communist collective, where every worker gets paid the same regardless of output and there are no promotions (0% competition, 100% cooperation). Another is Lampert’s Sears (100% competition, 0% cooperation). Others are normal businesses, where employees mostly work together for the good of the company but also compete for promotions (X% competition, Y% cooperation). Presumably the normal business outcompetes both Lampert and the commies, and we sigh with relief and continue having normal businesses. And if some of the normal businesses outcompete others, we’ve learned something about the best values of X and Y.

7. Ideas. These are in constant evolutionary competition – this is the insight behind memetics. The memetic equivalent of slack is inferential range, aka “willingness to entertain and explore ideas before deciding that they are wrong”.

Inferential distance is the number of steps it takes to make someone understand and accept a certain idea. Sometimes inferential distances can be very far apart. Imagine trying to convince a 12th century monk that there was no historical Exodus from Egypt. You’re in the middle of going over archaeological evidence when he objects that the Bible says there was. You respond that the Bible is false and there’s no God. He says that doesn’t make sense, how would life have originated? You say it evolved from single-celled organisms. He asks how evolution, which seems to be a change in animals’ accidents, could ever affect their essences and change them into an entirely new species. You say that the whole scholastic worldview is wrong, there’s no such thing as accidents and essences, it’s just atoms and empty space. He asks how you ground morality if not in a striving to approximate the ideal embodied by your essence, you say…well, it doesn’t matter what you say, because you were trying to convince him that some very specific people didn’t leave Egypt one time, and now you’ve got to ground morality.

Another way of thinking about this is that there are two self-consistent equilibria. There’s your equilibrium, (no Exodus, atheism, evolution, atomism, moral nonrealism), and the monk’s equilibrium (yes Exodus, theism, creationism, scholasticism, teleology), and before you can make the monk budge on any of those points, you have to convince him of all of them.

So the question becomes – how much patience does this monk have? If you tell him there’s no God, does he say “I look forward to the several years of careful study of your scientific and philosophical theories that it will take for that statement not to seem obviously wrong and contradicted by every other feature of the world”? Or does he say “KILL THE UNBELIEVER”? This is inferential range.

Aristotle supposedly said that the mark of an educated man is to be able to entertain an idea without accepting it. Inferential range explains why. The monk certainly shouldn’t immediately accept your claim, when he has countless pieces of evidence for the existence of God, from the spectacular faith healings he has witnessed (“look, there’s this thing called psychosomatic illness, and it’s really susceptible to this other thing called the placebo effect…”) to Constantine’s victory at the Mulvian Bridge despite being heavily outnumbered (“look, I’m not a classical scholar, but some people are just really good generals and get lucky, and sometimes it happens the day after they have weird dreams, I think there’s enough good evidence the other way that this is not the sort of thing you should center your worldview around”). But if he’s willing to entertain your claim long enough to hear your arguments one by one, eventually he can reach the same self-consistent equilibrium you’re at and judge for himself.

Nowadays we don’t burn people at the stake. But we do make fun of them, or flame them, or block them, or wander off, or otherwise not listen with an open mind to ideas that strike us at first as stupid. This is another case where we have to balance competition vs. slack. With perfect competition, the monk instantly rejects our “no Exodus” idea as less true (less memetically fit) than its competitors, and it has no chance to grow on him. With zero competition, the monk doesn’t believe anything at all, or spends hours patiently listening to someone explain their world-is-flat theory. Good epistemics require a balance between being willing to choose better ideas over worse ones, and open-mindedly hearing the worse ones out in case they grow on you.

(Thomas Kuhn points out that early versions of the heliocentric model were much worse than the geocentric model, that astronomers only kept working on them out of a sort of weird curiosity, and that it took decades before they could clearly hold their own against geocentrism in a debate).

Different people strike a different balance in this space, and those different people succeed or fail based on their own epistemic ruleset. Someone who’s completely closed-minded and dogmatic probably won’t succeed in business, or science, or the military, or any other career (except maybe politics). But someone who’s so pathologically open-minded that they listen to everything and refuse to prioritize what is or isn’t worth their time will also fail. We take notice of who succeeds or fails and change our behavior accordingly.

Maybe there’s even a third layer of selection; maybe different communities are more or less willing to tolerate open-minded vs. close-minded people. The Slate Star Codex community has really different epistemic norms from the Catholic Church or Infowars listeners; these are evolutionary parameters that determine which ideas are more memetically fit. If our epistemics make us more likely to converge on useful (not necessarily true!) ideas, we will succeed and our epistemic norms will catch on. Francis Bacon was just some guy with really good epistemic norms, and now everybody who wants to be taken seriously has to use his norms instead of whatever they were doing before. Come up with the right evolutionary parameters, and that could be you!