Bruce -- With all due respect,
are you kidding???
So, just hypothetically, if a tax rate cut generated a great degree of incremental growth such that GDP ended up much larger than it otherwise would, even if it generated so much GDP growth that revenues increased (in real terms or even in real and per capita terms), you'd call it a reduction in revenues per "the only metric that really matters". In other words, the more effective and beneficial in terms of GDP impact, the worse it is per your "only metric that really matters" (and yes, I'm saying that you are clearly implying a that reduction in revenues per that metric counts against the merits of that policy).
Let me be clear about something. I think it's ridiculous and harmful that the "tax cuts increase revenues" myth persists among conservatives. A few years ago I even went to the trouble of compiling this list
No, the Bush Tax Cuts Have NOT Generated Higher Revenues | Swords Crossed to provide to the analytically-challenged conservative ditto-heads who buy into that silliness (a belief which shows an utter lack of understanding of the basic concept of correlation, let alone causation).
And I favor higher taxes, not lower, as part of an overall package to address our long-term fiscal imbalance, along with substantial cuts in projected spending (both explicit expenditures and subsidies via the tax code).
So I'm not making a partisan point. I'm just saying your "only metric that really matters" seems nonsensical if the point is to downplay benefits and/or even cast in negative terms the effects of a tax cut. If I'm missing something, please let me know how it makes sense to claim that the revenue benefit (or harm) -- and in turn, to a large extent, the overall net benefit/harm -- of a tax cut should be measured solely by a metric whose magnitude (and positive vs. negative condition)
declines as the benefits of the policy
increase.
To further illustrate, if (again just hypothetically) a tax
increase devastated GDP, leading to deep recession and/or much lower growth on an ongoing basis than would otherwise occur, your "only metric that really matters" could show a substantial
increase (in revenues as a % of GDP), even if revenues actually declined (in real terms). Would you suggest that such a dynamic be held out as a positive effect of that policy?