Economists generally define the short run as being Question 1 options: any period of time less than one year. that period of time in which at least one of the firm's inputs, usually plant size, is fixed. any period of time less than six months. that period of time in which all inputs are variable.

that period of time in which at least one of the firm's inputs, usually plant size, is fixed

Explanation:

The short run is a period of time when at least one factor of production is fixed.

The short run isn't defined by a period of time. The short run is unique to different firms and industries.

The long run is a period of time when all factors of production are variable.

I hope my answer helps you

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