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Answer:
60 pizzas
40 pizzas
Explanation:
Marginal product measures the change in output as a result of a change in input by one unit
Marginal product = change in output / change in input
Marginal product for the 4th worker
Change in output = 360 - 300 = 60 pizzas
Change in input = 4 - 3 = 1 worker
Marginal product = 60 / 1 = 60
Marginal product for the 5th worker
Change in output = 400 - 360 = 40 pizzas
Change in input = 5 - 4 = 1
Marginal product = 40 / 1 = 40
It can be seen that marginal product decreased from 60 to 40 when the 5th worker was added. This illustrates diminishing marginal returns.
The law of diminishing returns says as more units of a variable input is added to a fixed income of production, output might increase at a point but after some time total output would increase at a decreasing rate and marginal product would be decreasing.