Why is the Production Possibility Curve (PPC) concave to the origin ?

Question

Accepted Answer

The correct option is 1:

The Production Possibility Curve (PPC), or Production Possibility Frontier (PPF), is a graphical representation showing the maximum possible output combinations of two goods or services that an economy can achieve when all resources are fully and efficiently employed. The curve is typically drawn concave to the origin (bowed outwards) because of the **Law of Increasing Opportunity Costs**, which is synonymous with the **Law of Increasing Costs**. This law states that as an economy produces more of one good, it must sacrifice increasingly larger amounts of the other good. This occurs because resources are specialized; as resources are shifted from producing one good to another, the most suitable resources are used up first. Eventually, the economy must use resources that are less and less suited for the production of the second good, leading to a higher marginal sacrifice (opportunity cost) for each additional unit produced.

The incorrect option is 2:
The Law of Increasing Returns refers to a situation where the marginal product of an input increases as more of that input is used. If an economy operated under the Law of Increasing Returns, the opportunity cost would be decreasing, causing the PPC to be convex (bowed inwards) to the origin, which contradicts its observed shape.

The incorrect option is 3:
The Law of Decreasing Costs is another name for the Law of Decreasing Opportunity Costs. As explained above, if the opportunity cost were decreasing, the PPC would be convex to the origin, not concave. A straight-line PPC indicates constant opportunity costs (neither increasing nor decreasing).

The incorrect option is 4:
The term "Law of increasing production" is not a recognized economic principle used to explain the shape of the PPC. While the PPC itself represents the boundary of maximum possible production, its specific concave shape is determined by the cost structure, which is the increasing opportunity cost.