The long run is best defined as a time period during which at least one input cannot be changed. during which all inputs can be varied. during which consumer demand for goods and services change. that is longer than two years. One thing that distinguishes the short run and the long run is the number of months considered. implicit costs. the existence of marginal costs. the existence of at least one fixed input.

The long run is best defined as a time period

One thing that distinguishes the short run and the long run is

Explanation:

On the long run, all productive inputs can be changed and/or altered. that includes fixed costs like equipment and machinery, building facilities, processes, wages, etc.

On the short run, at least one of the inputs used to produce our goods or services cannot be changed, e.g. wages tend to be sticky, fixed costs (depreciation of equipment and machinery, buildings, etc.)

answer; ///i believe that the correct answer is (a) it is the means by which a person earns money;

it's d. out with the planting and harvest of the crops.