What’s the difference between the short run and the long run? In which case are there fixed and variable costs

What’s the difference between the short run and the long run? In which case are there fixed and variable costs of production and in which case are there only variable costs?

Answer:
In the two input model of production the two inputs are labor and capital. The short run is defined as a period of time too short for the firm to vary the quantity of capital that it uses. Hence, in the short run capital is a fixed input and costs associated with capital are called fixed costs; labor is a variable input and costs associated with labor are called variable costs.

The long run is a period of time long enough for the firm to vary the quantities of both inputs that it uses. Hence, in the long run both inputs are variable inputs and all costs are variable costs.

You might think of capital as the physical building that the firm uses. Doing that makes it intuitive that the firm can much more readily vary the amount of labor that it uses than it can vary its capital (i.e., size of its building).
the Short run is defined as the time period when some factor is fixed. The Long run is defined as the time period whe nall factors are variable

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