Jane Psmith reviews The WEIRDest People in the World: How the West Became Psychologically Peculiar and Particularly Prosperous by Joseph Henrich:

Until 2002, diplomats at the United Nations didn’t have to pay their parking tickets. Double-parking, blocking a fire hydrant, blocking a driveway, blocking an entire midtown Manhattan street — it didn’t matter; when you have diplomatic plates, they let you do it. In the five years before State Department policy changed in November 2002, UN diplomats racked up a whopping 150,000 unpaid parking tickets worth $18 million in fines. (Among other things, the new policy allowed the city to have 110% of the amount due deducted from the US foreign aid budget to the offending diplomats’ country. Can you believe they never actually did it? Lame.) Anyway, I hope you’re not going to be surprised when I say that the tickets weren’t distributed evenly: the nine members of Kuwait’s UN mission averaged almost 250 unpaid tickets apiece per year (followed by Egypt, Chad, Sudan, Bulgaria, and Mozambique, each between 100 and 150; the rest of the top ten were Albania, Angola, Senegal, and Pakistan). The UK, Canada, Australia, Denmark, the Netherlands, Sweden, and Norway had none at all. The rest of the rankings are more or less what you’d expect: for example, Italy averaged three times as many unpaid tickets per diplomat as France and fifteen times as many as Germany.

What did the countries with the fewest unpaid parking tickets have in common? Well, they generally scored low on various country corruption indexes, but that’s just another way of saying something about their culture. And the important thing about their culture is that these countries are WEIRD: western, educated, industrialized, rich, and democratic. But they’re also, in the grand scheme of human history, weird: their inhabitants think differently, behave differently, and value different things than most humans. Among other things, WEIRD people are individualistic, nonconformist, and analytical. They — okay, fine, we — are particularly hard-working, exhibit low time preference, prefer impersonal rules we apply universally, and elevate abstract principles over contextual and relationship-based standards of behavior. In other words, WEIRD people (as Joseph Henrich and his colleagues pointed out in the influential 2010 paper where they coined the phrase) are outliers on almost every measure of human behavior. Wouldn’t it be silly for an entire academic discipline (and therefore an entire society ideologically committed to Trusting The Experts) to base all its assumptions about human nature on psych lab experiments starring American undergraduates? That would give us a wildly distorted picture of what humans are generally like! We might even do something really dumb like assume that the social and political structures that work in WEIRD countries — impersonal markets, constitutional government, democratic politics — can be transplanted wholesale somewhere else to produce the same peace and prosperity we enjoy.

Ever since he pointed out the weirdness of the WEIRD, Henrich has been trying to explain how we got this way. His argument really begins in his 2015 The Secret of Our Success, which I reviewed here and won’t rehash. If you find yourself skeptical that material circumstances can drive the development of culture and psychology (unfortunately the term “cultural Marxism” is already taken), you should start there. Here I’m going to summarize the rest of Henrich’s argument fairly briefly: first, because I don’t find it entirely convincing (more on that below), and second, because I’m less interested in how we got WEIRD than in whether we’re staying WEIRD. The forces that Henrich cites as critical to the forging of WEIRD psychology are no longer present, and many of the core presuppositions of WEIRD culture are no longer taken for granted, which raises some thought-provoking questions. But first, the summary.

Henrich argues that the critical event setting the West on the path to Educated, Industrialized, Rich, and Democratic was the early medieval western Church’s ban on cousin marriage. That might seem a little odd, but bear in mind that most of the humans who’ve ever lived have been enmeshed in incredibly dense kin networks that dictate obligations, responsibilities, and privileges: your identity is given from birth, based simply on your role as a node in an interdependent network. When societies grow beyond the scale of a family, it’s by metaphorically extending and intensifying these kinship bonds (go read our review of The Ancient City for more on this). These kinship networks perpetuate themselves through marriage, and particularly through marriage to relatives, whether blood or in-laws, to strengthen existing connections. Familial or tribal identities come first, before even the claims of universal religions, as when Wali Khan, a Pakistani politician, phrased his personal allegiances as “I have been a Pashtun for six thousand years, a Muslim for thirteen hundred years, and a Pakistani for twenty-five.” You could imagine Edwin of Northumbria or Childeric saying something pretty similar.

Then, beginning in the 4th century, the western Church began to forbid marriages to relatives or in-laws, the kinship networks began to wither away, and alternative social technologies evolved to take their place. In place of the cousin-marriers’ strong tight bonds, conformity, deference to traditional authority, and orientation toward the collective, you get unmoored individuals who have to (or get to, depending on your vantage point) create their own mutually beneficial relationships with strangers. This promotes a psychological emphasis on personal attributes and achievements, greater personal independence, and the development of universalist social norms. Intensive kinship creates a strong in-group/out-group distinction (there’s kin and there’s not-kin): people from societies with strong kinship bonds, for instance, are dramatically more willing to lie for a friend on the witness stand. WEIRD people are almost never willing to do that, and would be horrified to even be asked. Similarly, in societies with intensive kinship norms, you’d be considered immoral and irresponsible if you didn’t use a position of power and influence to benefit your family or tribe; WEIRD people call that nepotism or corruption and think it’s wrong.