Ep 129 - Back Porch Files: The Horse, the Sparrow, and the Lie of Trickle-Down

Before anyone called it “trickle-down economics,” there was another way of describing the same basic idea. It was called the horse-and-sparrow theory. Feed the horse enough oats, the thinking went, and eventually some of those oats would pass through the horse, land on the road, and the sparrows would get something to eat. It is crude. It is unflattering. And it may be one of the most accidentally honest metaphors ever attached to an economic theory.

For decades, we’ve been told that if we feed the horse, the sparrow will eventually eat too.

For decades, Americans have been sold versions of the same promise. Give businesses more room to prosper. Give investors stronger incentives. Reduce taxes on capital. Leave more money in the hands of people who already have the resources to invest. Then watch as those benefits move outward through the economy in the form of new businesses, more hiring, greater productivity, higher wages, and stronger growth. The horse gets fed first, but eventually, we are told, everyone eats.

And to be fair, that argument is not inherently ridiculous. Investment matters. Capital matters. Businesses need money to buy equipment, expand operations, develop products, hire workers, and take risks. Lower taxes can improve the after-tax return on an investment and, in some cases, make a project more attractive than it otherwise would have been. The strongest version of supply-side economics is not “give rich people money and hope they share.” It is an argument about incentives.

That distinction matters, because if we are going to judge trickle-down economics, we should judge the version its advocates actually defend. The theory says that when investors and businesses keep more of the return from economic activity, they are more likely to invest. More investment can produce higher productivity. Higher productivity can support higher wages. Business expansion can create jobs. A stronger private sector can generate broader economic growth. That is the promise.

The problem is not that none of those things can happen. They can. The problem is whether the broader benefits happen reliably, substantially, and at anything close to the scale used to justify the policies in the first place. That is a much harder question.

Ronald Reagan did not invent this theory, but his presidency helped turn its modern American version into one of the defining economic ideas of the Republican Party. The language was more polished by then. No one was standing at a lectern talking about horses and sparrows. They talked about marginal tax rates, capital formation, investment, productivity, and growth. The 1981 Reagan tax cuts were sold not merely as lower taxes, but as a way to stimulate investment, create jobs, raise productivity, and strengthen the economy.

That gives us a standard by which to judge the results. If policies that disproportionately reward capital owners, investors, and high-income households are supposed to produce unusually strong downstream benefits, then those benefits should show up somewhere. We should see stronger investment. Stronger productivity. Stronger employment. Stronger wages. Stronger broad-based prosperity.

The evidence does not support anything close to the certainty of the sales pitch. Research examining major tax cuts for the rich across multiple wealthy countries has found that those cuts reliably increased the share of income flowing to the top, while producing no clear corresponding improvement in growth or unemployment. That does not prove tax cuts can never affect growth. It does mean the most dramatic promises attached to them have been much easier to make than to demonstrate.

The same pattern appears in the United States when we look at the distribution of income over time. Incomes rose across the distribution. That is important to acknowledge. The story is not that everyone outside the top one percent stood completely still for forty years. But the gains were much larger at the top. The top one percent’s share of income increased dramatically over the period in which supply-side economic policy became enormously influential.

Again, that does not mean tax policy caused every change in inequality. Technology changed. Globalization changed. Union membership declined. Monetary policy, trade, industry concentration, labor-market changes, recessions, and financialization all matter. There is no honest way to reduce four decades of economic history to one tax bill or one president.

But there is also no honest reason to ignore the gap between the promise and the payoff. If the sales pitch was that disproportionate benefits at the top would generate unusually strong gains for everyone else, the historical record is much less impressive than the rhetoric. The wealthy did better. Capital owners accumulated more. The indirect payoff to everyone else was far less dramatic.

And that brings us to what I think is the biggest structural weakness in trickle-down economics: there is no automatic mechanism that forces wealth created at the top to become broadly shared prosperity. 

Give a corporation an additional hundred million dollars in after-tax income and it has options. It can build a factory. It can hire workers. It can buy equipment. It can fund research. Those things can produce broad economic benefits. But it can also increase dividends, buy back stock, acquire another company, raise executive compensation, reduce debt, hold cash, or invest in financial assets. None of those choices are automatically illegitimate. But they are also not the same as raising worker wages.

The same is true for individuals who already possess large amounts of capital. Wealth does not sit still. It compounds. Stocks appreciate. Dividends arrive. Interest accumulates. Real estate rises in value. Returns are reinvested and generate additional returns. The person living primarily on wages starts each year dependent on another year of work. The person with significant assets begins the year with wealth that can produce more wealth.

That is the missing mechanism. Trickle-down economics is not a conveyor belt. It is a theory of incentives. Incentives can influence behavior, but they do not dictate it. There is no economic law requiring an additional dollar retained at the top to move through a predictable sequence until part of it lands in a worker’s paycheck.

Which brings us back to the present. Corporate profits are extremely high. Businesses are capable of generating extraordinary returns to capital. At the same time, recent inflation-adjusted wage data show how easily corporate prosperity and worker prosperity can move on different tracks. Strong profits at the top do not guarantee stronger purchasing power at the bottom.

That does not prove one caused the other. It does not mean profits are illegitimate. It does not mean every dollar earned by a corporation should have been paid out in wages. It simply demonstrates something the trickle-down argument too often treats as automatic: prosperity for capital and prosperity for workers are related, but they are not the same thing. 

And the theory has not disappeared. Politicians rarely call their own ideas “trickle-down economics.” They talk about investment, competitiveness, tax relief, economic growth, job creation, and productivity. But the underlying logic remains familiar: reduce the tax cost of investment, increase the return to capital, give businesses stronger incentives to expand, and expect those gains to spread through the broader economy.

That logic continues to appear in modern Republican economic policy. And again, precision matters. Not every tax cut in a Republican bill is trickle-down. Broad household tax relief, child-related tax credits, and working-class tax reductions are different from policies designed primarily to benefit corporations, investors, or high-income households on the theory that the gains will later spread outward.

The distinction matters because it keeps the argument honest. The issue is not “tax cuts bad.” The issue is whether policies that start by directing disproportionate benefits upward have actually produced the broad downstream payoff repeatedly promised on their behalf.

After decades of trying versions of this theory, that question becomes harder to avoid. If the most immediate and predictable benefits continue to flow to people who already own large amounts of capital, while the broader gains arrive more slowly, less reliably, and in smaller proportions, at what point do we stop calling the problem insufficient patience?

That is where the difference between failure and scam becomes uncomfortable. A theory can fail and still be sincerely believed. Plenty of economists, investors, business owners, and politicians genuinely believe stronger incentives for capital create enough growth to justify the unequal starting point. That belief alone is not proof of deception.

But a theory can also remain extremely useful politically even when its economic results repeatedly fall short of its rhetoric. “We want to reduce taxes on corporations and wealthy investors because we want them to have more money” is not a particularly attractive campaign slogan. “We want to reduce taxes on them because it will create jobs, raise wages, grow the economy, and help you too” is a much better sales pitch.

That does not prove bad faith. But after enough decades, the public has every right to judge the pitch by the results. At some point, “just feed the horse a little more” stops sounding like a prediction and starts sounding like an excuse.

America does not have a wealth-creation problem. We are very good at creating wealth. We build enormous companies. We generate extraordinary profits. We create new industries and vast private fortunes. The question is not whether the horse can get bigger. We already know it can.

The question is who captures the gains, who gets the security, who gets the higher asset values, who gets the dividend, who gets the raise, and who is still waiting for the benefits they were told would eventually reach them.

The horse was fed. The horse grew. The horse got fat.

Maybe it is time to stop asking whether feeding the horse creates more oats.

Ask the sparrow how much ever reached the ground. 

SOURCES

John Kenneth Galbraith, “Recession Economics” — horse-and-sparrow theory - https://www.nybooks.com/articles/1982/02/04/recession-economics/

Ronald Reagan Library — 1981 Address to Congress on the Program for Economic Recovery - https://www.reaganlibrary.gov/archives/speech/address-joint-session-congress-program-economic-recovery-1981

Ronald Reagan Library — White House Report on the Program for Economic Recovery - https://www.reaganlibrary.gov/archives/speech/white-house-report-program-economic-recovery

U.S. Treasury — Revenue Effects of Major Tax Bills, including the Economic Recovery Tax Act of 1981 - https://home.treasury.gov/system/files/131/WP-81.pdf

Congressional Budget Office — Taxing Capital Income: Effective Marginal Tax Rates Under 2014 Law and Selected Policy Options - https://www.cbo.gov/publication/49817

London School of Economics — Research on major tax cuts for the wealthy across 18 OECD countries - https://www.lse.ac.uk/research/research-for-the-world/economics/tax-cuts-for-the-wealthy-only-benefit-the-rich-debunking-trickle-down-economics

Congressional Budget Office — The Distribution of Household Income, 2022 - https://www.cbo.gov/publication/62300

Bureau of Economic Analysis — Corporate Profits, including Q2 2026 data - https://www.bea.gov/data/income-saving/corporate-profits

Bureau of Labor Statistics — Real Earnings, August 2026 - https://www.bls.gov/news.release/realer.nr0.htm

Bureau of Labor Statistics — Employment Situation, August 2026, including nominal wage growth - https://www.bls.gov/news.release/empsit.htm

Joint Committee on Taxation — General Explanation of the Tax Provisions of Public Law 119-21 - https://www.jct.gov/publications/2026/jcs-1-26/

White House Council of Economic Advisers — Economic analysis of the One Big Beautiful Bill’s investment, wage, and growth provisions - https://www.whitehouse.gov/research/2025/06/the-one-big-beautiful-bill-legislation-for-historic-prosperity-and-deficit-reduction/

Congressional Budget Office — Distributional effects of the 2025 Reconciliation Act on household resources - https://www.cbo.gov/interactive/2025-reconciliation-act