Stage 2 of production is the most efficient (lowest cost) stage to produce in. Which of the following is correct?
1. Stage 2 ends where Average Product turns negative (or is zero, same thing)
2. stage 2 ends where Average Product is maximized
3.Stage 2 ends where Marginal Product turns negative (or is zero, same thing)
4.Stage 2 ends where Marginal Product is maximized