the the law of diminishing marginal returns group of answer choices causes average total cost to rise at a decreasing rate as output increases. causes the difference between average total cost and average variable cost to get smaller as output increases. explains why the average total cost, average fixed cost, and the marginal cost curves are u-shaped in the short run. explains why the average total cost and marginal cost curves are u-shaped in the short run.law of diminishing marginal returns
