I'm not saying that what he did worked as stated. The thing about Economics- agreement across the board is damned near impossible unless discussed in the simplest terms.
From the link,
"ERTA lowered the tax rate for top earners from 70 to 50 percent, reduced tax rates across the board by 23 percent (to be phased in over three years), and enacted numerous other changes that reduced individual taxes." and
"In addition to greatly simplifying the tax code (reducing tax shelters and the number of tax brackets), the act lowered the top tax rate for individuals from 50 to 28 percent and lowered the top corporate tax rate from 50 to 35 percent. The legislation also raised the lowest tax rate from 11 to 15 percent, making it the first time in history that the lowest and highest tax rates had been raised and lowered, respectively, at the same time."
Reaganomics is the popular term for the economic policies of U.S. Pres. Ronald Reagan. The word is a portmanteau of ‘Reagan’ and ‘economics’ and was first attributed to radio broadcaster Paul Harvey. It has been used by both Reagan’s supporters and critics.
www.britannica.com