Hauser's law is the proposition 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.[1] 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 - 2007.[2]
So...yeah, marginal rates have been 70% or higher...but the Federal government has never successfully collected that much, due to write-offs, tax shelters, and other schemes that were largely closed in 1986 with...