In the short run, the point at which diminishing marginal returns to labor begin is the point at which the marginal cost curve Naim 21:59 Microeconomic Theory Chapter 7 In the short run, the point at which diminishing marginal returns to labor begin is the point at which the marginal cost curve A) peaks. B) bottoms out. C) is upward sloping. D) is downward sloping. Answer: bottoms out. Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+