For a monopolist, if total revenue increases as output decreases, then marginal revenue is

What is the difference between "diminishing marginal returns" and "diseconomies of scale"?

A) Both concepts explain why marginal cost increases after some point but diminishing marginal returns applies only in the short run when there is at least one fixed factor, while diseconomies of scale applies in the long run when all factors are variable. B) Diminishing marginal returns, which applies only in the long run when all factors are variable, explains why average variable cost increases, while diseconomies of scale, which applies in the short run when at least one factor is fixed, explains why average total cost increases. C) Diminishing marginal returns, which applies only in the short run when at least one factor is fixed, explains why marginal cost increases, while diseconomies of scale, which applies in the long run when all factors are variable, explains why average cost increases. D) Both concepts explain why average total cost increases after some point but diminishing marginal returns applies only in the short run when there is at least one fixed factor, while diseconomies of scale applies in the long run when all factors are variable.

Events that shift the Ap demand schedule to the left also cause ________ the IS curve

A) movements downward along B) movements upward along C) parallel rightward shifts of D) parallel leftward shifts of