This is not totally correct. One reason it appears that fertility is inversely correlated with income is hidden confounding variables. Among comparable populati

This is not totally correct. One reason it appears that fertility is inversely correlated with income is hidden confounding variables. Among comparable populations (within the same country, as a starting point) income is positively related to income. https://www.niussp.org/fertility-and-reproduction/income-and-fertility-a-positive-relationship/ https://www.niussp.org/fertility-and-reproduction/income-and...