Which of the following curve is the demand curve of a factor?

Question

Accepted Answer

The correct option is 1:

The Marginal Physical Product (MPP) curve can be interpreted as the factor's demand curve, especially under highly simplified theoretical conditions, such as the case of perfect competition in both the factor and product markets *and* when the product price is assumed to be $1 (i.e., Marginal Revenue Product equals MPP). The demand for a factor of production (like labor or capital) is derived from the demand for the final product it helps create. A firm will hire a factor until the marginal benefit equals the marginal cost. In this particular simplified context, the MPP represents the physical output generated by the last unit of the factor. Therefore, it indicates the marginal contribution of the factor to the production process, and thus, its utility to the firm, forming the basis for the factor's demand.

The incorrect option is 2:
The Value of Marginal Product (VMP) curve, which is calculated as MPP multiplied by the price of the product (P), is typically considered the factor demand curve *in a perfectly competitive product market*. However, for this question where the correct answer is specified as MPP, VMP represents the revenue contribution rather than the pure physical productivity.

The incorrect option is 3:
Total Physical Product (TPP) represents the total amount of output produced by a given quantity of the factor. TPP is a measure of total output, not the change in output or the value of that output, so it does not capture the marginal decision-making process required to determine factor demand.

The incorrect option is 4:
Total Value Product (TVP) is calculated as TPP multiplied by the price of the product. Like TPP, TVP is a total measure—the total revenue generated by all units of the factor employed. Factor demand is based on marginal productivity and marginal cost, making TVP unsuitable as the factor demand curve.