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Interesting point: In Japan the oil shock in early 1970s caused price inflation and it correlates with an increase in childlessness / delaying starting a family
In Korea, there was a currency crisis in the 1990s which also correlated with a rise in childlessness.
In Germany student protests of 1968 correlated with an increase in childlessness.
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Counterpoint would be that many other developing countries also experienced economic shocks but didn't see a decline in birth rates. If I had to bet money I'd say it's more cultural than economic
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Some of it is definitely cultural, but the section of the doc that mentions these economic shocks (across time) segues into the pattern of unexpected / unwanted childlessness. These would be populations where the cohort of 0 children (as opposed to just fewer children) surged. I gather the point it was making was that where and when the childless statistics surged it was largely due to economic shocks.
The 0 children cohort is important because in many places it surged rapidly, it brought down the rate to below replacement levels. It also signals a failure to "get off the ground" as opposed to having 1 kid and stopping by choice.
EDIT: It's the section of the 'vitality curve'
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