Reagan's tax cuts didn't lower the unemployment rolls. In fact 30% of the tax cuts left the economy. The data just don't support your premise. GWB cut taxes and failed to create net new jobs. Instead both his and Reagan's tax cuts had the effect of amplifying speculative investments.

And this is exactly what GINI index based analysis indicates will happen. It turns out that the upper income brackets are particularly INEFFICIENT investors of money. They invest their "core assets" in "safe" fixed income investments that have well below market yields. Then once their "monthly expenses" are met, they invest about 1/2 of the rest in normal market investments and the rest (about 30%) goes into speculative investments or luxoury (typically overseas) spending.

That doesn't create jobs very effectively. Fixed Income vehicles typically are T bills, which primarily go to service government debt - that doesn't create jobs. Speculative investments don't create much in the way of jobs and luxoury spending is very very inefficient in creating jobs.

Sorry Reagan's and GWBs tax cuts FAILED