There are several states that move from Karl Marx-like policies to Adam Smith-like policies and back again in a weekend. So for the states with huge volatility in their income tax policies over time, the differences in growth rates in those periods are really amazingly consistent with tax rates really mattering.

And you can't have a prosperous economy when the government is way overspending, raising tax rates, printing too much money, over regulating and restricting free trade. It just can't be done.

Let's take the nine states that have no income tax and compare them with the nine states with the highest income tax rates in the nation. If you look at the economic metrics over the last decade for both groups, the zero-income-tax-rate states outperform the highest-income-tax-rate states by a fairly sizable amount.

Government spending is taxation. When you look at this, I've never heard of a poor person spending himself into prosperity; let alone I've never heard of a poor person taxing himself into prosperity.

The income effects in an economy always sum to zero.

Sound money is the sine qua non of a prosperous society.

The zero-income-tax-rate states have far faster growth in tax revenues than did the states with highest income tax rate over this period.