Unfortunately, I don’t find data for how birth rate correlates with income in Germany. Only for the US: https://www.statista.com/statistics/241530/birth-rate-by-family-income-in-the-us/
But if education costs are very important than I would expect that at the top percentile the people with more money, who can afford to send more children to college get more children. That doesn’t seem to be the case.
Unfortunately, I don’t find data for how birth rate correlates with income in Germany. Only for the US: https://www.statista.com/statistics/241530/birth-rate-by-family-income-in-the-us/
But if education costs are very important than I would expect that at the top percentile the people with more money, who can afford to send more children to college get more children. That doesn’t seem to be the case.