Trickle-Down Effect

You have probably seen a champagne tower at a wedding or a party. Pour drink into the glass at the very top, and the moment it fills and spills over, the liquid runs down into the glasses just below it.

The idea was that the economy could work the same way if money reached big corporations and wealthy people first. When a large company pays less corporate tax (the tax a business pays on the income it earns), it has more room to spend. It can research new technology, build factories, and hire more people.

More jobs mean fatter wallets for the people who work, and they buy more at their local shops. That is the core of the idea: a company's growth flows down to the whole society.

If money keeps moving from top to bottom with nothing in the way, the thinking went, the whole economy grows and everyone ends up better off, even if the government never directly helps poor people.

In the real world, though, the water often did not run down the tower so smoothly. It is as if the top glass kept growing bigger and bigger, holding on to everything instead of spilling over.

Even after taxes were cut, some companies did not build new factories at home or hire more workers. They sat on piles of cash. Some moved to overseas plants where production was cheaper, and others spent the money only on automation.

Critics also point out that high earners often do not spend extra income on goods that put money into the market. Instead, they tend to tie it up in real estate or financial products. That way the money never reaches the bottom, and it stays stuck on the top floor.

Several studies found that after tax cuts for the wealthy, growth and jobs did not clearly rise. Only the top earners' share of income grew, and the gap between rich and poor got wider.

The phrase "trickle-down" was already being used as criticism in the United States in the 1930s. It spread widely in the 1980s as a label for the tax cuts of Ronald Reagan's "supply-side economics." That policy rested on the idea that cutting taxes would boost businesses' drive to produce and bring the whole economy back to life.

Over time, international organizations looked at decades of real data. A 2015 International Monetary Fund (IMF) report found that when the richest 20% take a bigger share of income, later economic growth actually gets weaker. The Organisation for Economic Co-operation and Development (OECD) also published an analysis in 2014 showing that growing income inequality slows growth.

The usual explanation is that wealthy people don't raise their spending much when they get extra money, while ordinary households tend to spend extra money on living costs right away.

Today, opinions on the effects of tax cuts remain divided. Another view, the trickle-up effect (sometimes called the fountain effect), is often discussed alongside it. It argues for raising the incomes of ordinary and middle-class households so that spending starts from the bottom.