Supply-Side Tax Cuts are a political strategy, not economic policy.
https://www.bunkhistory.org/resources/1407?related=1213&relationship_name=ANOTHER%20ANGLE
"Some Republicans have gotten so cocky about their supply side political strategy that they flirt with discarding their rhetorical concern about deficits altogether. As Mark Walker, Republican of North Carolina and chairman of the Republican Study Committee explained, deficits are a great talking point when you have an administration thats Democrat-led. Today? Its a little different now that Republicans have both houses and the administration.
The verdict is essentially in on supply-side tax cuts they dont pay for themselves, and the economic benefits they offer skew heavily toward the top of the income distribution. The deficits they create, meanwhile, consistently put fiscally responsible Democrats on the defense, forcing them to make difficult choices between valued social programs and in doing, dividing their base. At the same time, Republicans deliver gratuitous tax cuts for their own base."