Economy
Trickle-Down Economics: 40 Years of Evidence
Supply-side economics — the theory that cutting taxes on the wealthy creates growth that benefits everyone — has been the dominant framework of Republican economic policy since 1980. It has been tested at scale four times at the federal level and in numerous states. The results are in.
The Reagan tax cuts of 1981 reduced the top marginal tax rate from 70% to 50% (and eventually 28%). The promised deficit reduction did not happen — the deficit tripled. The economy did recover from the early 1980s recession, but that recovery was largely driven by the Federal Reserve cutting interest rates from their emergency highs, not by the tax cuts. Median wages stagnated through the 1980s.
The Bush tax cuts of 2001 and 2003 reduced the top rate to 35% and cut capital gains taxes. The promised job creation did not materialize — the 2000s produced the weakest job growth of any decade in modern American history. The deficit expanded significantly. The decade ended in the worst financial crisis since 1929.
The Trump 2017 Tax Cuts and Jobs Act reduced the corporate tax rate from 35% to 21% and cut the top individual rate to 37%. The promised "rocket ship" growth and wage explosion did not happen. GDP growth in 2018-2019 was solid but not substantially above trend. Corporate stock buybacks — using the tax savings to repurchase shares rather than invest in workers — hit a record $1 trillion in 2018. (Federal Reserve Bank of San Francisco, Tax Cut and Growth Analysis)
Kansas is the most controlled experiment. Governor Brownback's 2012 "real live experiment" in supply-side economics — massive income tax cuts — produced severe budget shortfalls, cuts to schools, below-average growth, and credit rating downgrades. The Republican-controlled legislature eventually reversed most of the cuts.
The countries with the highest taxes on wealth and corporations — the Scandinavian economies, Germany, Netherlands — have not experienced the collapse the theory predicts. They have stronger safety nets, higher median wages, and comparable or better growth.
Trickle-down economics has not been disproven in theory — it has been tested in practice, repeatedly, and found wanting. The deficit explodes. Wages stagnate. The promised tide does not lift all boats. The theory survives not because of evidence but because the people who benefit from it fund the politics.