Final answer:
In the short run, fixed factors of production limit a firm's ability to adjust to market conditions, while in the long run, all factors of production can be altered allowing for complete adaptability.
Step-by-step explanation:
To distinguish between the short run and the long run in the context of business and economics:
- In the short run, a firm's plant and some factors of production are fixed, meaning that they cannot change the usage of these fixed inputs. For example, they may be working with a certain capacity of machinery or buildings that they cannot alter immediately.
- In the long run, the firm can adjust all factors of production, which includes changing the plant size, technology, or other capital resources. This provides the firm with the flexibility to scale up or down according to market demands and long-term strategic plans.
The correct answer to the question is therefore option A: 'In the short run, a firm's plant is fixed; in the long run, a firm can change its plant.'