"It’s a myth to think of the US as uniquely free from monetary and fiscal constraints. The US has special powers to issue debt and find willing purchasers, of course, but freedom to issue debt is not the same as freedom to spend. In 1978, the world’s central banks were prepared to abandon their dollar reserves if the US continued to pursue an inflationary politics, as it did under Carter. So in the supply-side view, the US as dollar hegemon is quite limited in the kinds of spending it can support. Off the table is anything that’s too redistributive or liberating—welfare, or investment in free education and health care—because these empower labor and the poor.
By contrast, spending on defense, police, and prisons was fine, as were so-called tax cuts, which are really tax expenditures. The supply siders proposed a budget that was extremely generous in subsidizing financial wealth holders—creating these government-subsidized markets for capital gains—and extremely austere in subsidizing wages or spending on the poor. I think this captures the real motives behind the business revolt of the 1970s. Despite appearances, supply siders weren’t screaming for less government; they were screaming for government to subsidize capital income on a new basis. Hence this shift from industrial profits to capital gains."
https://www.nplusonemag.com/online-only/online-only/against-the-people/