Comment by jakecrouch

There are many other parallels that can be drawn between the 1930s and the 2010s. Ray Dalio's theory about long term debt cycles explains this in a non-ad-hoc way - every 50-75 years an economy's debt becomes too high and must be deleveraged. In a globalized economy this will happen to many countries at the same time and lead to tensions between debtor and creditor countries.