The ratio of capital-to-labor money was at an unusual low even in the US during that era. It has since been returning to its pre-WW2 levels. Piketty addresses W

The ratio of capital-to-labor money was at an unusual low even in the US during that era. It has since been returning to its pre-WW2 levels. Piketty addresses WW2 a lot in his book, for many reasons including that this economic anomaly occurred during this period.