A) Straight line
B) Concave
C) Backward leading
D) Convex
✅ ANSWER: D
If marginal opportunity cost is falling, the PPF would be convex. Pay Per Click curve can be convex to the origin when the opportunity cost decreases. This can happen only when less and less units are foregone of first commodity for the introduction of additional unit of another commodity. Due to increasing marginal opportunity cost. PPC becomes concave to origin.
If marginal opportunity cost is falling, the PPF would be convex. Pay Per Click curve can be convex to the origin when the opportunity cost decreases. This can happen only when less and less units are foregone of first commodity for the introduction of additional unit of another commodity. Due to increasing marginal opportunity cost. PPC becomes concave to origin.