In terms of the change in birth rates over time, with the gradual decl…
The decline in birth rates (measured here as total fertility rate, or TFR, which is the average number of children per woman) over the past 70 years correlates strongly with both increasing GDP per capita (as a proxy for capitalist wealth) and increasing education levels. However, education is a stronger individual predictor than GDP per capita alone, and a two-variable model fits slightly better than either single-variable model.
To arrive at the best-fitting equation, I collected world average…
Answer by Grok