If we assume that labor is the only variable input, the slope of the total product curve in the short run

A) has no economic significance.
B) measures the average product of labor.
C) measures the marginal product of labor.
D) measures both the marginal and average product at all points on the total product curve.

Marginal Product

The boost in production resulting from one more unit of input.

Total Product Curve

A graphical representation showing how the total quantity of output produced by a firm varies with the quantity of a variable input, keeping all other inputs constant.

Average Product

The output per unit of input, such as the quantity of goods produced per unit of labor.