Its biggest problem isn't that it reaches the wrong conclusions -- it is usually very unclear what the right conclusions are -- or that it doesn't make the same assumptions as supply-siders.
Supply-siders further suggest that what's needed is a large cut in federal spending to reduce the government's role in the economy and make it more dynamic.
Although supply-siders promised increased investment as a result of top-rate and corporate tax cuts, growth and investment suffered for now in the context of high interest rates.