Tax Cuts for the Rich Don't Boost Growth—LSE Study Confirms

For decades, the promise that cutting taxes on the rich will spur growth has driven policy from Reagan to Trump. A new analysis from LSE researchers David Hope and Julian Limberg, published in the Socio-Economic Review, pours cold water on that idea. Looking at major tax cuts for top earners across 18 wealthy nations over 50 years, they found no meaningful effect on economic growth or unemployment—but a clear increase in income inequality.

The study, which became the most downloaded paper in LSE Research Online history, examined 18 advanced economies over five decades. The researchers compared countries that implemented significant tax cuts for the rich with those that didn't, using a difference-in-differences approach. The results were stark: the rich got richer, and there was no measurable boost to the broader economy.

Hope explains the mechanism: 'If you cut taxes on the rich, they then bargain more aggressively for their own compensation at the direct expense of workers lower down the income distribution.' This is classic rent-seeking—CEOs and top executives capturing a larger share of existing wealth without creating new value.

Why the idea persists

Despite the evidence, trickle-down economics remains politically potent. The researchers note that the average citizen is poorly informed about how dramatically taxes on the rich have fallen over the past 40 years. When presented with that information, support for further cuts drops—especially among Republican voters.

The paper's policy implication is blunt: don't cut taxes on the rich to boost the economy, particularly if you care about inequality. As Hope points out, Trump's 2017 Tax Cuts and Jobs Act was sold as 'rocket fuel' for the US economy, but the study finds no evidence across 18 economies over 50 years that such cuts deliver.

The political firestorm

The research went viral, drawing reactions from both extremes: 'This cannot be true' and 'Thank you Captain Obvious.' The authors argue this polarization underscores the need for data-driven approaches that cut through partisan noise.

For engineers and technologists, the lesson extends beyond economics: evidence-based policy matters, and the same rigor we apply to systems should apply to the societal structures that shape our industry. The concentration of wealth affects everything from who can afford to build startups to the diversity of the talent pool.