Short-run supply elasticity depends on production adjustability

Steps:

• Recall supply elasticity measures how quickly quantity supplied responds to price changes; inelastic means limited short-run response.
• For the new drug, extensive research, testing, and approval processes prevent rapid production scaling, making supply inelastic.
• For printed newspapers, existing printing facilities with spare capacity allow quick output increases via extra shifts or runs, making supply elastic.
• Evaluate choices: Only C explains the time-based production differences driving elasticity variances.

Why C is correct:

• Supply elasticity is higher with excess capacity (quick adjustment possible) and lower when fixed factors like R&D require long lead times, per economic definition of short-run constraints.

Why the others are wrong:

• A: Unit costs affect profitability, not the speed of production adjustment for elasticity.
• B: Chance discovery is irrelevant to supply response; newspaper production is fast, not longer.
• D: Product similarity impacts demand elasticity via substitutes, not supply elasticity.

Final answer: C