Capitalism and Socialism: Two sides of the same materialist coin.
The world went to 8 billion people under the various forms of capitalism. However, every country that has adopted any of the forms of socialism ended up suffering from a dearth of births.
There is not a single socialist nation that is thriving, in terms of replacing themselves with children.
“Capitalism also leads to birth dearth”
More precisely, having women enter the work force does. A woman who stays home raising kids does not get a salary.
Perhaps a one-child tax exemption sufficient to cause middle class women to find children more affordable would help? As a percentage of income, not a set dollar amount.