Pray tell, show us this 'solidly demonstrated'.
if you will look at our collection over the past few years
you will note that while tax
rates varied wildly,
revenue rates did not; generally holding steady at 18-19% of GDP, irrespective of the tax
rate. people seek to avoid exposure to taxes, and the higher the tax rates, the greater their incentive to do so. on the margin you depress the activity that is taxed. within the range of GDP that is collected, lower taxes
seem to push it higher, but rather than simply assuming a direct (rather than indirect through increased GDP) effect, we should note that the period of greatest tax rate variation is the period of greatest revenue rate stability, and the period of greatest revenue rate variability occured during a time that was marked by fairly stable tax rates.
Revenue, therefore, is mostly a function of GDP. if you want to increase revenue, take steps that would more rapidly increase GDP. if you want to depress revenue, take steps that would slow the growth (or reduce) GDP.
this isn't to say that tax cuts are or should be a one-stop-shop. I would argue at our current point we probably would gain more through tax code simplification. Currently we spend 330 Billion
just complying with the Tax code; that's unconcionable. imagine the effect of just 2/3rds of that in savings
every year; invested in the economy and compounded over time? reducing tax code complexity and the regulatory burden are two great non-tax methods of increasing GDP.