Production Possibilities Curve and What It Shows

Explanation With Examples

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 Photo by Marcie Gonzalez/Getty Images

production possibility curve measures the maximum output of two goods using a fixed amount of input. The input is any combination of the four factors of productionnatural resources (including land), laborcapital goods, and entrepreneurship. The manufacture of most goods requires a mix of all four. Each point on the curve shows how much of each good will be produced when resources shift from making more of one good and less of the other.

The curve measures the trade-off between producing one good versus another.

For example, say an economy can produce 20,000 oranges and 120,000 apples. On the chart, that's point B. If it wants to produce more oranges, it must produce fewer apples. On the chart, Point C shows that if it produces 45,000 oranges, it can only produce 85,000 apples.

By describing this trade-off, the curve demonstrates the concept of opportunity cost. Making more of one good will cost society the opportunity of making more of the other good.

Production Possibility Frontier

The production possibility curve portrays the cost of society's choice between two different goodsAn economy that operates at the frontier has the highest standard of living it can achieve, as it is producing as much as it can using the same resources. If the amount produced is inside the curve, then all of the resources are not being used. On the chart, that is point E.

One possible reason could be a recession or depression when there is not enough demand for either good. Layoffs can also occur, resulting in lower levels of labor being used.

Other reasons can be a bit more complicated. An economy falls within the curve when it is ignoring its comparative advantage. For example, Florida has the ideal environment to grow oranges, and Oregon's climate is best for apples. Florida has a comparative advantage in orange productions, and Oregon has one in apple production. If Florida ignored its advantage in oranges and tried to grow apples, it would force the U.S. to operate within its curve, and the standard of living would fall.

Conversely, any point outside the PPF curve is impossible. More of both goods cannot be produced with the limited resources. On the chart, that is point F.

What the Shape of the Curve Tells You

The production possibility curve bows outward. The highest point on the curve is when you only produce one good, on the y-axis, and zero of the other, on the x-axis. On the chart, that is Point A. The economy produces 140,000 apples and zero oranges.

The widest point is when you produce none of the good on the y-axis, producing as much as possible of the good on the x-axis. On the chart, that is point D. The society produces zero apples and 40,000 oranges.

All the points in between are a trade-off of some combination of the two goods. An economy operates more efficiently by producing that mix. The reason is that every resource is better suited to producing one good than another. Some land is better suited for apples, while other land is best for oranges. Society does best when it directs the production of each resource toward its specialty. The more specialized the resources, the more bowed out the production possibility curve.

How It Affects the Economy

The curve does not tell decision-makers how much of each good the economy should produce; it only tells them how much of each good they must give up if they are to produce more of the other good. It is up to them to decide where the sweet spot is.

In a market economy, the law of demand determines how much of each good to produce. In a command economy, planners decide the most efficient point on the curve. They are likely to consider how best to use labor so there is full employment.

An economy's leaders always want to move the production possibilities curve outward and to the right, and can only do so with growth.

They must create more demand for either or both products. Only after that occurs can more resources can be used to produce greater output.

Supply-side economists believe the curve can be shifted to the right by simply adding more resources, but without demand, they will only succeed in creating underutilized resources. There can be a benefit in increasing the labor force, though. Once the unemployed are working, they will increase demand and shift the curve to the right. For it to work, they must be paid enough to create the demand that shifts the curve outward. There must also be enough unemployed to make a difference. An economy in full employment won't add more workers, no matter how much corporate taxes are cut.

A decrease in resources can limit growth. If there is a shortage of one input, then more goods will not be produced, no matter how high the demand. In those situations, prices rise until demand falls to meet supply. It creates cost-push inflation.