Economic Rent

Economic rent is the part of a payment to an owner of land, labor or capital that exceeds the minimum needed to keep that resource in its current use. It is income earned not because more effort or investment is supplied, but because the resource is scarce, protected or uniquely placed. Economists use the concept to analyze land values, natural resources, star salaries, licenses, patents and monopoly profits.

The term has a narrower meaning than everyday rent, the payment a tenant makes to a landlord, although part of a landlord's income may be economic rent. It is also distinct from rent-seeking, the effort to obtain economic rents through lobbying or legal privilege rather than by creating value. The minimum payment needed to keep a resource in its current use is called its transfer earnings, which equal its opportunity cost.

Suppose a famous singer would happily perform for a modest fee, because her next best job, teaching music, pays far less. Yet promoters pay her millions, because there is only one of her and crowds want to see her. Most of what she earns is not what it takes to get her on stage; it is a reward for being rare. That surplus is economic rent.

The same is true of a plot of land in a city center. The land was there before anyone built on it, and it cannot be made bigger. Its high price reflects its location, not work done by the owner.

Economic rent is the difference between what a resource earns and what it would earn in its best alternative use:

The actual payment is the income the resource receives in its current use; transfer earnings are the minimum it would accept to stay there. A software engineer earns $250,000 a year at a large technology firm. Her best alternative job pays $140,000. Her economic rent is $250,000 − $140,000 = $110,000. If her employer cut her pay to $150,000, she would still stay, which shows that $110,000 of her salary was not needed to keep her. When the supply of a resource is fixed, so that supply is perfectly inelastic, transfer earnings are close to zero and almost the whole payment is economic rent.

David Ricardo set out the theory of differential rent in 1817, as part of classical economics. He argued that farmland of different fertility earns rents equal to its advantage over the poorest land in use, so rising food demand raises landlords' income without any extra effort on their part. Henry George built on this in Progress and Poverty (1879) to argue for a tax on land values. Alfred Marshall introduced "quasi-rent" for the temporary surplus earned by machines and other capital that cannot be quickly expanded, and later economists extended the idea to all factors of production, including labor.

Gordon Tullock analyzed the social cost of competing for rents in 1967, and Anne Krueger coined the term "rent-seeking" in 1974 in a study of import licenses. A rent seeker spends resources trying to win privileges, which can waste much of the value at stake.

• Natural resources. Oil, gas and minerals sell for far more than the cost of extraction. The World Bank publishes estimates of total natural resource rents as a share of GDP; in some economies they make up a large part of output, which links to the resource curse.
• Legal privilege. Licenses, quotas, patents and other intellectual property create temporary scarcity. Patents trade a period of rent for an incentive to innovate.
• Market power. Firms protected by barriers to entry, or in winner-takes-all markets, can earn persistent profits above the competitive level. When regulators protect incumbents, this can reflect regulatory capture.
• Scarce talent. Stars in sport, entertainment and finance can earn wages far above their transfer earnings.

Because a pure rent is a surplus over the minimum needed to keep a resource in use, taxing it does not, in theory, reduce supply. That is why many economists across schools regard land value taxes and resource taxes as efficient, and why tax incidence analysis predicts that a tax on fixed land falls on its owner. The same reasoning is used to justify a windfall tax on sudden gains, such as the UK Energy Profits Levy introduced in 2022 after energy prices surged. Supporters of a wealth tax sometimes argue that large fortunes partly reflect accumulated rents.

Critics note that rents are hard to identify in practice. Profits that look like rents may be rewards for earlier risk-taking or innovation, and taxing them can deter future investment. Windfall taxes are criticized for creating uncertainty, and resource taxes may discourage exploration if set too high. Measuring transfer earnings requires knowing what people and assets could earn elsewhere, which is seldom observed. Economists also debate how much rising rents explain economic inequality, with some studies pointing to market power and housing costs and others to technology and skills.

• World Bank Open Data: Total natural resources rents (% of GDP)