- Explain price controls, price ceilings, and price floors
- Analyze demand and supply as a social adjustment mechanism
To this point in the chapter, we have been assuming that markets are free, that is, they operate with no government intervention. In this section, we will explore the outcomes, both anticipated and otherwise, when government does intervene in a market either to prevent the of some good or service from rising “too high” or to prevent the price of some good or service from falling “too low”.
Economists believe there are a small number of fundamental principles that explain how economic agents respond in different situations. Two of these principles, which we have already introduced, are the laws of demand and supply.
Governments can pass laws affecting market outcomes, but no law can negate these economic principles. Rather, the principles will become apparent in sometimes unexpected ways, which may undermine the intent of the government policy. This is one of the major conclusions of this section.
Controversy sometimes surrounds the prices and quantities established by demand and supply, especially for products that are considered necessities. In some cases, discontent over prices turns into public pressure on politicians, who may then pass legislation to prevent a certain price from climbing “too high” or falling “too low.”
The demand and supply model shows how people and firms will react to the incentives that these laws provide to control prices, in ways that will often lead to undesirable consequences. Alternative policy tools can often achieve the desired goals of price control laws, while avoiding at least some of their costs and tradeoffs.
Laws that government enact to regulate prices are called . Price controls come in two flavors. A keeps a price from rising above a certain level (the “ceiling”), while a keeps a price from falling below a given level (the “floor”). This section uses the demand and supply framework to analyze price ceilings. The next section discusses price floors.
A price ceiling is a legal maximum price that one pays for some good or service. A government imposes price ceilings in order to keep the price of some necessary good or service affordable. For example, in 2005 during Hurricane Katrina, the price of bottled water increased above $5 per gallon. As a result, many people called for price controls on bottled water to prevent the price from rising so high. In this particular case, the government did not impose a price ceiling, but there are other examples of where price ceilings did occur.
In many markets for goods and services, demanders outnumber suppliers. Consumers, who are also potential voters, sometimes unite behind a political proposal to hold down a certain price. In some cities, such as Albany, renters have pressed political leaders to pass rent control laws, a price ceiling that usually works by stating that landlords can raise rents by only a certain maximum percentage each year. Some of the best examples of rent control occur in urban areas such as New York, Washington D.C., or San Francisco.
Rent control becomes a politically hot topic when rents begin to rise rapidly. Everyone needs an affordable place to live. Perhaps a change in tastes makes a certain suburb or town a more popular place to live. Perhaps locally-based businesses expand, bringing higher incomes and more people into the area. Such changes can cause a change in the demand for rental housing, as Figure 3.9a illustrates. The original equilibrium (E0) lies at the intersection of supply curve S0 and demand curve D0, corresponding to an equilibrium price of $500 and an equilibrium quantity of 15,000 units of rental housing. The effect of greater income or a change in tastes is to shift the demand curve for rental housing to the right, as the data in Table 3.9a shows and the shift from D0 to D1 on the graph. In this market, at the new equilibrium E1, the price of a rental unit would rise to $600 and the equilibrium quantity would increase to 17,000 units.
Figure 3.9a A Price Ceiling Example—Rent Control (Text Version)
The vertical axis is Price (dollars in monthly rent) in increments of $100 and the horizontal axis is Quantity (thousands of rental units) going up by increments by a thousand.
D0 is the original demand curve that slopes downward left to right. S0 is the supply curve and slopes upward from left to right. The original intersection of demand and supply occurs at E0 (15,000 rental units, $500 in monthly rent). If demand shifts from D0 to the left to the new demand curve D1,which still slopes downward left to right.
After the shift the new equilibrium would be at E1 (17,000 rental units, $600 in monthly rent) occurring at the intersection of S0 and D1. But if there is a price ceiling at $500 (denoted by a flat line at $500) then the price is not permitted to rise, therefore instead of E1 (17,000 rental units, $600 in monthly rent), the quantity supplied remains at 15,000. However, after the change in demand, the quantity demanded rises to 19,000, resulting in a shortage resulting in a new point intersecting D1 and the price ceiling at ($19,000 rental units, $500 in monthly rent).
Figure 3.9a A Price Ceiling Example—Rent Control: The original intersection of demand and supply occurs at E0. If demand shifts from D0 to D1, the new equilibrium would be at E1—unless a price ceiling prevents the price from rising. If the price is not permitted to rise, the quantity supplied remains at 15,000. However, after the change in demand, the quantity demanded rises to 19,000, resulting in a shortage.
|Price||Original Quantity Supplied||Original Quantity Demanded||New Quantity Demanded|
Suppose that a city government passes a rent control law to keep the price at the original equilibrium of $500 for a typical apartment. In Figure 3.9a, the horizontal line at the price of $500 shows the legally fixed maximum price set by the rent control law. However, the underlying forces that shifted the demand curve to the right are still there. At that price ($500), the quantity supplied remains at the same 15,000 rental units, but the quantity demanded is 19,000 rental units. In other words, the quantity demanded exceeds the quantity supplied, so there is a shortage of rental housing. One of the ironies of price ceilings is that while the price ceiling was intended to help renters, there are actually fewer apartments rented out under the price ceiling (15,000 rental units) than would be the case at the market rent of $600 (17,000 rental units).
Price ceilings do not simply benefit renters at the expense of landlords. Rather, some renters (or potential renters) lose their housing as landlords convert apartments to co-ops and condos. Even when the housing remains in the rental market, landlords tend to spend less on maintenance and on essentials like heating, cooling, hot water, and lighting. The first rule of economics is you do not get something for nothing—everything has an opportunity cost. Thus, if renters obtain “cheaper” housing than the market requires, they tend to also end up with lower quality housing.
Price ceilings are enacted in an attempt to keep prices low for those who need the product. However, when the market price is not allowed to rise to the equilibrium level, quantity demanded exceeds quantity supplied, and thus a shortage occurs. Those who manage to purchase the product at the lower price given by the price ceiling will benefit, but sellers of the product will suffer, along with those who are not able to purchase the product at all. Quality is also likely to deteriorate.
A price floor is the lowest price that one can legally pay for some good or service. Perhaps the best-known example of a price floor is the minimum wage, which is based on the view that someone working full time should be able to afford a basic standard of living. The federal minimum wage in 2016 was $7.25 per hour, although some states and localities have a higher minimum wage. The federal minimum wage yields an annual income for a single person of $15,080, which is slightly higher than the Federal poverty line of $11,880. As the cost of living rises over time, the Congress periodically raises the federal minimum wage.
Price floors are sometimes called “price supports,” because they support a price by preventing it from falling below a certain level. Around the world, many countries have passed laws to create agricultural price supports. Farm prices and thus farm incomes fluctuate, sometimes widely. Even if, on average, farm incomes are adequate, some years they can be quite low. The purpose of price supports is to prevent these swings.
The most common way price supports work is that the government enters the market and buys up the product, adding to demand to keep prices higher than they otherwise would be. According to the Common Agricultural Policy reform passed in 2013, the European Union (EU) will spend about 60 billion euros per year, or 67 billion dollars per year (with the November 2016 exchange rate), or roughly 38% of the EU budget, on price supports for Europe’s farmers from 2014 to 2020.
Figure 3.9b illustrates the effects of a government program that assures a price above the equilibrium by focusing on the market for wheat in Europe. In the absence of government intervention, the price would adjust so that the quantity supplied would equal the quantity demanded at the equilibrium point E0, with price P0 and quantity Q0. However, policies to keep prices high for farmers keeps the price above what would have been the market equilibrium level—the price Pf shown by the dashed horizontal line in the diagram. The result is a quantity supplied in excess of the quantity demanded (Qd). When quantity supplied exceeds quantity demanded, a surplus exists.
Economists estimate that the high-income areas of the world, including the United States, Europe, and Japan, spend roughly $1 billion per day in supporting their farmers. If the government is willing to purchase the (or to provide payments for others to purchase it), then farmers will benefit from the price floor, but taxpayers and consumers of food will pay the costs. Agricultural economists and policy makers have offered numerous proposals for reducing farm subsidies. In many countries, however, political support for subsidies for farmers remains strong. This is either because the population views this as supporting the traditional rural way of life or because of industry’s lobbying power of the agro-business.
Figure 3.9b European Wheat Prices: A Price Floor Example (Text Version)
The vertical axis is Price (P) and the horizontal axis is Quantity (Q).
The demand curve (D) slopes in a downward curve from left to right. The supply curve (S) slopes downward from right to left. The intersection of demand (D) and supply (S) would be at the equilibrium point E0 at (Q0, P0). However, a price floor set at Pf holds the price above E0 and prevents it from falling.
The Price floor (Pf) is denoted by a flat line intersecting with the S and D curves above point E0, creating two new points where they intersect. The result of the price floor is that the quantity supplied Qs (occurring at the intersection of Pf and S and to the right of Q0) exceeds the quantity demanded Qd (occurring at the intersection of Pf and D and to the left of Q0). The difference between these two points shows the excess supply, also called a surplus.
Figure 3.9b European Wheat Prices: A Price Floor Example The intersection of demand (D) and supply (S) would be at the equilibrium point E0. However, a price floor set at Pf holds the price above E0 and prevents it from falling. The result of the price floor is that the quantity supplied Qs exceeds the quantity demanded Qd. There is excess supply, also called a surplus.
Price ceilings prevent a price from rising above a certain level. When a price ceiling is set below the equilibrium price, quantity demanded will exceed quantity supplied, and excess demand or shortages will result. Price floors prevent a price from falling below a certain level. When a price floor is set above the equilibrium price, quantity supplied will exceed quantity demanded, and excess supply or surpluses will result. Price floors and price ceilings often lead to unintended consequences.
Except where otherwise noted, this chapter is adapted from “Price Ceilings and Price Floors” and “Key Concepts and Summary” In Principles of Economics 2e (OpenStax) by Steven A. Greenlaw & David Shapiro, licensed under CC BY 4.0./ Adaptations include addition of key concepts and summary.
Access for free at Principles of Microeconomics 2e
Original Source Chapter References
Costanza, Robert, and Lisa Wainger. “No Accounting For Nature: How Conventional Economics Distorts the Value of Things.” The Washington Post. September 2, 1990.
European Commission: Agriculture and Rural Development. 2013. “Overview of the CAP Reform: 2014-2024.” Accessed April 13, 205. http://ec.europa.eu/agriculture/cap-post-2013/.
Radford, R. A. “The Economic Organisation of a P.O.W. Camp.” Economica. no. 48 (1945): 189-201. http://www.jstor.org/stable/2550133.
Landsburg, Steven E. The Armchair Economist: Economics and Everyday Life. New York: The Free Press. 2012. specifically Section IV: How Markets Work.
National Chicken Council. 2015. “Per Capita Consumption of Poultry and Livestock, 1965 to Estimated 2015, in Pounds.” Accessed April 13, 2015. https://www.nationalchickencouncil.org/about-the-industry/statistics/per-capita-consumption-of-poultry-and-livestock-1965-to-estimated-2012-in-pounds/.
Wessel, David. “Saudi Arabia Fears $40-a-Barrel Oil, Too.” The Wall Street Journal. May 27, 2004, p. 42. https://online.wsj.com/news/articles/SB108561000087822300.
Pew Research Center. “Pew Research: Center for the People & the Press.” http://www.people-press.org/.
- Figure 3.21 A Price Ceiling Example—Rent Control © Steven A. Greenlaw & David Shapiro (OpenStax) is licensed under a CC BY (Attribution) license
- Figure 3.22 European Wheat Prices: A Price Floor Example © Steven A. Greenlaw & David Shapiro (OpenStax) is licensed under a CC BY (Attribution) license
What a buyer pays for a unit of the specific good or service
Government laws to regulate prices instead of letting market forces determine prices
A legal maximum price
A legal minimum price
At the existing price, quantity supplied exceeds the quantity demanded; also called a surplus