Answer: Any combination on the production possibilities frontier that brings the highest level of satisfaction to the people in the economy.
Step-by-step explanation:
The Production Possibilities Frontier depicts the quantities of two goods that can be produced given that resources are limited and being used to produce the same goods.
Allocative efficiency therefore is any point on this frontier that brings the highest level of satisfaction to the people based on their needs and wants. For instance if people want more clothing than cell phones they should pick any points from B to E.
So long as it is on the PPF, there is Allocative efficiency.