In: Economics
When marginal product is increasing
b. Marginal cost is decreasing
Reason
When marginal product increases, marginal cost is decreasing because more output can be produced with less inputs. The additional worker employed are more productive and it will help to produce more quantity of output by using lesser inputs. The marginal cost curve is U shaped due to law of variable proportion. According to this law marginal product first increases and then decreases ,due to which marginal cost first decreases and then increases.