Time Horizon Affects Supply Elasticity for Crops

Steps:

• Price elasticity of supply (PES) measures responsiveness of quantity supplied to price changes.
• In the short run for rice, output is fixed by planting and harvest cycles, making supply inelastic.
• In the long run, farmers can adjust land use and inputs, making supply more elastic.
• Option D matches this pattern, explaining the time factor in planting.

Why D is correct:

• Agricultural supply follows the law of variable proportions: short-run inelasticity due to fixed factors (e.g., planting lag), long-run elasticity as all inputs adjust (PES > 1 possible).

Why the others are wrong:

• A: Essentiality affects demand elasticity, not supply; rice supply remains inelastic short-term regardless.
• B: Production methods improve long-run elasticity, but short-run supply is inelastic, not highly elastic.
• C: Fixed land constrains long-run supply, making it less elastic overall, not highly elastic.

Final answer: D