SK: When tax rates change it takes a while for the actors in the economy to change their behavior, then the hiring, investing, building etc. to increase or decrease, then output and incomes to change, then the tax revenues approaching the following year’s tax deadline of April 15 to change. These time lags are why it is difficult to ascribe a change in government revenues to an earlier change in the tax rate. And that’s why I gave you the six-year result after the tax rates were changed under Kennedy and then Reagan.
