Chapter 5 Production, Cost, and Supply | 163 6. Suppose a firm has the production function KL 9 (K, L ) = (a) Does this production function exhibit decreasing, constant, or increasing returns to scale? Prove your answer. (b) Assuming this firm is a price-taker, find its conditional input demand functions. (c) If labor were free to this firm, would it ever use capital in the long run? Justify your