Hauser's law

Empirical observation of US federal tax revenues

Hauser's law is the empirical observation that, in the United States, federal tax revenues since World War II have always been approximately equal to 19.5% of GDP, regardless of wide fluctuations in the marginal tax rate. Historically, since the end of World War II, federal tax receipts as a percentage of gross domestic product averaged 17.9%, with a range from 14.4% to 20.9% between 1946 and 2007.

This keyword could refer to multiple things. Here are some suggestions: