If all the countries have a 70% rate is OK, but if a single country has this rate, the millionaire will move to other countries, and so, they will not pay the 70% anyway.
In the immediate post WWII time, all the developed countries had very high top marginal income tax rate and they had high gdp growth rates
Can't speak for other countries, but hardly anyone in the United States in, say, the 1950s was paying the tax rates we conveniently throw around to "prove" that the tax burden was higher on the wealthy then.
Poll
