I haven't read any meta studies or a plethora of individual ones that make the claim you said is supported by the studies. Just for example, is a tax increase to fund new roads and improve schools in a community always a drag on the local economy versus an equivalent tax cut? I'm nearly (99.9% or so) sure the answer to that is no. It would be equally wrong to assert that each tax cut in the U.S. at the federal level will generate more economic return than the spending that must be cut to fund it, all the way to a tax rate of zero. Given that I'm nearly sure any study looking at spending versus tax cuts is HIGHLY specific about the conditions under which various options are preferred, and that you've misstated or oversimplified the conclusions, but we can't know that or even have an informed discussion without looking at your sources, which you won't provide.