How do economists characterise the short run?

1. A Option A: All inputs being variable
2. B Option B: No variable inputs, that is, all factors of production are fixed
3. C Option C: A period in which the law of diminishing returns does not hold
4. D Option D: At least one fixed factor of production and firms neither leaving nor entering the industry

Answer checked 11 October 2026 · How we write and check questions