Answer:
b. As you expand output, your marginal productivity eventually declines
a. decreasing average costs as production increases
a. lower average costs when multiple different products are produced
Step-by-step explanation:
The law of diminishing marginal returns states that as more unit of variable factors of production are added to production, output would increase at first but after a period, it would increase at a negative rate.
Economies of scale is the reduction in cost thay accrue to firms as they increase production. For example, a supplier might give a firm a discount for buying in bulk.
Economies of scope states that average cost would fall as the production of similar products increases. For example, a fashion designer who makes women's clothings decides to make scarfs with the scraps of clothes left.
I hope my answer helps you