However it IS true that marginal-rate tax decreases always increase societal wealth, potentially increasing tax revenue and certainly increasing employment towards its theoretical maximum of 95%.
at at = that at, d’oh.
The economic notion of the "point of diminishing returns" would definitely apply here. Few but true leftists dispute that tax decreases have stimulated economic activity and increased tax revenues. We seem to be bouncing from the low to the high 30%s as a marginal tax rate.
When the Dims raise it back to 39% (where Clinton had it), or higher, a future Republican administration can again take it to around 30% and again increase economic activity and tax revenue. But there is a point where further decreases in tax rates will decrease tax revenues, probably somewhere between 25% and 30%, the point of diminishing returns.
But, once again, the Dims are setting things up for future Republican tax decreases and revenue increases, and they will stall any economic recovery next year by increasing taxes back to 39% or higher.