or these production Michelle's business produces ceramic cups using labor, clay, and a kiln. She uses labor and clay in a fixed pro- portion, but has only one kiln. She can manufacture 25 cups a day with one worker and 35 with two workers. a. Does this information illustrate decreasing returns to scale or a diminishing marginal prod- uct of labor? What is the likely explanation for why output doesn't increase proportionately with the number of workers? b. Michelle believes that if she could use two kilns and two workers, she could produce 55 cups a day. If so, what can you say about returns to scale