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Tran Hung Dao's avatar

I've always been extremely dubious about fertility gaps based desired number of children.

If we asked people how many times a week they wanted to exercise, and found the actual number was much lower, we would probably assume the desired number is a mostly made up aspirational signalling thing and that their revealed preferences are a better guide to what they actually want.

I saw one study that followed lottery winners to see if that sudden infusion of a lot of money resulted in people finally having the children they had previously claimed they couldn't afford. Nope, almost no effect. Just like we don't generally see billionaires running running around with even 3 or 4 children. (Other than Elon Musk.)

One problem with all the studies is they aren't longitudinal and fall prey to the end-of-history illusion. I saw one study that followed a group of women in Africa over a number of years, asking them how many children they desired. The number changed with each survey (trending down) but even more notable is they never realised they had changed their mind. They claimed that was the number they had ALWAYS desired, even though the researchers had previous survey data showing it wasn't true.

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Mohan's avatar

Another great round-up. On the primal world beliefs paper, an interesting subtlety is that it's only *child reports of* parental warmth that significantly predict Good, Safe and Enticing. Parental reports of parental warmth don't significantly correlate with anything. (The two measures correlate at r = 0.54.)

This adds to a growing body of evidence that parental reports of subjective characteristics are too biased to be reliable (due to social desirability bias, etc.) and some eminent psychologists have recently called for a moratorium on their use. [ https://uclpress.co.uk/book/matters-of-significance/ ]

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