This theory has been definitively debunked. There are not too many things that economists agree on or are well-established, but the law of supply and demand and the idea that there is any trickle down effect from accumulated wealth at the top are two which are.
From ChatGPT:
What the evidence shows:
1.
- Studies from organizations like the OECD, IMF, and various academic economists have shown that cutting taxes for the wealthy does not significantly increase GDP growth, investment, or job creation.
- In fact, a 2020 paper published in the American Economic Review looked at 50 years of data in 18 wealthy countries and found no significant growth benefit from major tax cuts for the rich.
2.
- Trickle-down policies tend to increase income and wealth inequality. The benefits disproportionately go to top earners, while wages and living standards stagnate for the middle and lower classes.
- The IMF in 2015 concluded: “If the income share of the top 20 percent increases, then GDP growth actually declines over the medium term.”
3.
- Reagan-era tax cuts in the 1980s did not produce the promised sustained boom; debt increased, inequality widened, and growth rates were not historically exceptional.
- Trump’s 2017 tax cuts disproportionately benefited corporations and the wealthy. While there was a short-term bump in investment, it did not lead to sustained wage growth or massive job creation.
What economists say:
Most mainstream economists across the ideological spectrum agree that
trickle-down economics lacks empirical support. Instead,
demand-side approaches—like investing in infrastructure, healthcare, education, or putting money in the hands of lower- and middle-income earners—have
stronger evidence for boosting economic activity.
In short:
Yes, trickle-down economics has been
widely discredited as a reliable policy framework for broad-based economic growth. While it may benefit the wealthy, there is
little evidence that it helps the economy as a whole in the ways its advocates claim.