What Is the Crowding Out Effect? Meaning and Examples
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
The crowding out effect is the drop in private spending, especially business investment, that occurs when rising government borrowing and spending push up interest rates.
Key takeaways
- Under partial crowding out, output still rises, but by less than the increase in government spending.
- Complete crowding out leaves total output unchanged and only shifts spending from private to public.
- Crowding out tends to be large at full employment and small when an economy has idle resources.
- After the Great Recession, large U.S. deficits came with low interest rates, which strong crowding out would not predict.
The crowding out effect is the reduction in private spending, especially business investment, that happens when government borrowing and spending rise. The main channel is interest rates: heavy government borrowing competes with households and firms for the same pool of savings, pushing up the cost of credit, so some private projects that made sense at the old rate are no longer worth financing. Higher taxes used to fund spending can have a similar effect by leaving people and businesses with less to spend or invest.
The idea challenges a simple assumption: that every dollar of government spending adds a full dollar to economic activity. If crowding out is strong, lost private activity offsets part of the public stimulus.
How the Crowding Out Effect Works
The textbook explanation uses the market for loanable funds. Savers supply funds; borrowers, including businesses, homebuyers and governments, demand them. The interest rate is the price that balances the two.
When a government runs a larger deficit, it finances the gap by selling bonds. Selling more bonds adds to the demand for loanable funds. If the supply of savings does not grow by the same amount, the interest rate has to rise until enough private borrowers drop out. Those private borrowers are the ones “crowded out.”
The sequence looks like this:
- The government increases spending or cuts taxes without cutting spending elsewhere.
- The deficit widens, so the Treasury issues more debt.
- Increased competition for savings raises interest rates.
- Businesses cancel or delay borrowed-money projects, and households borrow less for homes, cars and other big purchases.
- Part of the boost from public spending is offset by lower private investment and consumption.
The scale of the borrower matters: a large government such as the U.S. federal government can absorb a meaningful share of an economy’s lending capacity.
Interpreting the Crowding Out Effect
Economists distinguish between partial and complete crowding out. Under partial crowding out, private spending falls by less than the increase in government spending, so total output still rises, just by less than the spending itself. Under complete crowding out, private spending falls by the full amount, and fiscal stimulus leaves total output unchanged; only its composition shifts from private to public.
Where an economy lands depends largely on spare capacity. When factors of production are fully employed, the government can only gain resources by drawing them from private users, so crowding out tends to be large. With idle resources, government demand can put them to work without pulling much from the private sector.
There is also a feedback risk: if stimulus at full capacity weakens growth through crowding out, tax revenue can fall and push the government to borrow even more, in theory repeating the cycle.
Types of Crowding Out
Interest rate crowding out. The standard case described above: deficit financing raises borrowing costs and reduces private investment.
Tax crowding out. Higher taxes reduce disposable income and after-tax returns on investment, so households spend less and firms invest less.
Social welfare crowding out. Public programs can displace private provision. Taxes that fund welfare leave less income for charitable giving, and government aid can reduce the perceived need for donations. Expanding public health insurance such as Medicaid can lead some people to drop private coverage, shrinking private insurers’ risk pools and potentially pushing premiums higher.
Infrastructure crowding out. When the government builds roads, bridges or similar projects, private firms may decide that competing ventures, such as a toll road, are no longer profitable.
Open-economy crowding out. With free capital flows, higher domestic interest rates attract foreign capital and strengthen the domestic currency. That makes exports more expensive abroad and imports cheaper at home, so net exports fall, offsetting part of the stimulus. A closed economy lacks this exchange rate channel.
Example of the Crowding Out Effect
Hypothetical example; the figures are for illustration only.
A manufacturer is considering a $10 million plant expansion, financed entirely with a loan. It expects the expansion to generate $600,000 a year in operating profit. To keep the arithmetic simple, assume the loan is interest-only and ignore taxes.
- At a 4% loan rate, annual interest is $10 million × 4% = $400,000. Expected profit after interest: $600,000 − $400,000 = $200,000 a year.
- Suppose heavy government borrowing pushes the firm’s loan rate to 6.5%. Annual interest becomes $10 million × 6.5% = $650,000. Expected result after interest: $600,000 − $650,000 = −$50,000 a year.
The project has not changed, but its financing cost now exceeds its expected return, so the firm shelves it. Multiplied across many firms, that is the crowding out effect: the opportunity cost of public borrowing is the private projects that no longer get funded.
Crowding Out vs. Crowding In
Crowding in is the opposite claim: government spending can raise private activity. Post-Keynesian economists and Chartalists argue that in an underperforming economy, public spending creates jobs and income, lifting consumer demand and giving businesses a reason to invest. Public infrastructure can also make private investment more profitable, for example when a new road lowers a firm’s transport costs. The two ideas apply under different conditions:
| Crowding out | Crowding in | |
|---|---|---|
| Typical setting | Economy near full capacity | Recession, high unemployment |
| Effect on interest rates | Rise as government competes for savings | Little change, since private demand for credit is weak |
| Effect on private investment | Falls | Rises with demand and income |
Crowding in gained more attention after the Great Recession of 2007 to 2009. The U.S. federal government ran very large deficits, yet interest rates stayed low rather than spiking, which is not what a strong crowding out effect would predict.
Limitations of the Crowding Out Effect
- Monetary policy can offset it. If the central bank holds interest rates down while the government borrows, the interest rate channel weakens. This was a major reason rates stayed low after 2008.
- Global capital markets add supply. A government that can borrow from foreign savers puts less pressure on domestic savings, though the exchange rate channel may still apply.
- What the money buys matters. Productivity-raising spending, such as infrastructure or education, can support private investment over time even if it displaces some in the short run.
- Measurement is hard. Interest rates and investment respond to many forces at once, so estimates of the effect differ.
Whether crowding out is harmful depends on the trade. If public spending funds projects worth more than the private investment it displaces, the economy can still be better off; if not, long-run growth suffers.
FAQs
Does crowding out only happen with expansionary fiscal policy?
Mostly, yes. It describes the side effects of higher government spending or deficit-financed tax cuts. Reducing deficits works the other way, freeing savings for private borrowers, which is sometimes called reverse crowding out.
Is crowding out the same as inflation?
No. Crowding out is private spending being displaced, mainly through interest rates; inflation is a rise in the general price level. Government demand in a fully employed economy can push up both prices and rates, but one can occur without the other.
The Bottom Line
The crowding out effect matters to anyone weighing the real payoff of deficit spending, from policymakers to business owners planning borrowed-money projects. Its size depends on spare capacity, central bank policy and access to foreign savings. Public spending can still leave the economy better off if it funds projects worth more than the private investment it displaces.
