If the marginal (additional) opportunity cost is a constant, then the PPC would be:

Question

Accepted Answer

The correct option is 4:
The Production Possibility Curve (PPC), or Production Possibility Frontier (PPF), illustrates the trade-offs an economy faces when allocating its limited resources between the production of two goods. The shape of the PPC is directly determined by the Marginal Opportunity Cost (MOC), which is the additional amount of one good that must be sacrificed to produce one more unit of the other good. If the MOC is constant, it means that for every additional unit of one good produced, the same fixed amount of the other good must be given up. In geometry, a constant slope corresponds to a straight line. Therefore, a constant MOC results in a PPC that is a straight line sloping downward. This scenario implies that the resources are perfectly substitutable between the production of the two goods.

The incorrect option is 1:
A PPC that is convex to the origin indicates a decreasing marginal opportunity cost. This would mean that as an economy produces more of one good, the sacrifice required in terms of the other good continuously decreases, which is generally not assumed in basic economic models unless there are highly specialized resources being misused.

The incorrect option is 2:
A backward bending PPC is not a conventional representation for a standard Production Possibility Curve. PPCs are typically downward-sloping, reflecting scarcity and the need to give up one good to produce more of another, based on the fundamental assumption that resources are fully employed.

The incorrect option is 3:
A PPC that is concave to the origin is the most common and realistic shape in economics. It signifies an increasing marginal opportunity cost, also known as the Law of Increasing Opportunity Cost. This occurs because resources are not equally efficient in producing both goods, meaning progressively more of one good must be sacrificed to gain equal successive units of the other.