The true statement about the average product is:
Its graphical representation is the average product curve.
To elaborate on the other statements:
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It is defined as the additional output gained from hiring one additional unit of labor. - This statement describes the marginal product, not the average product.
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It cannot be represented graphically. - This statement is false; the average product can be represented graphically as the average product curve.
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It decreases before reaching a minimum and then increases. - This statement typically describes the behavior of the marginal product, rather than the average product. As more units of labor are added, average product may initially increase, reach a peak, and then decline, depending on the context, but it doesn't behave in a way that it decreases to a minimum and then increases.