Two reasons: U.S. tax rates are historically low, and taxes are a residual effect, not a causal effect, of economic activity.

FORBES: The Corporate Tax Debate? Ignore It and Think About Your Taxes

It motivated me to examine studies that use techniques far more likely to tease out the causal effect of Medicaid on health.

FORBES: Why Medicaid is a Humanitarian Catastrophe

The researchers said although a causal effect could not be proven, the way they had done the study strongly suggested that it was exposure to alcohol in the womb that was responsible for the differences in child IQ.

BBC: Moderate drinking in pregnancy 'harms IQ'