An inefficient combination (It is possible to get more of one good without giving up some of the other.) This is caused by unemployment of resources or underemployment of resources.
Productive Efficiency (Production is on the PPF.) On the PPF it is not possible to produce more of one good without giving up some of the other
What is the Marginal Cost of producing cars when we are producing 15,000 cars?
The slope of the PPF tells us the terms of the tradeoff. We approximate the slope by looking at the two nearest points to 15,000 cars.
Slope = -50/6 = -8.33 -50 6 The MC at 15,000 cars is approximately 8.33 bushels/car
At 20,000 cars the marginal benefit is just equal to the marginal cost. This is the optimal level of car production
Allocative Efficiency (The point on the PPF that society finds most desirable (20,100))