[dmwallin]

How are you going to decide which corporations are you going to tax? How are you going to get citizens from the upper percentage of the tax bracket to just agree to join a voluntary experiment.

It turns out that designing studies for national policies is REALLY hard due to the complexity of our modern society. Institutions exist across a large variety of scales and the smaller the study the more you have to account for external factors and abstract out things like funding sources, which are not directly connected to the effect of the money on the populace being studied.

It's much easier to look separately at the effects of income, and compare that to separate studies on the effect of higher taxation, to see if the tradeoffs are worth it.