Consider the following table for a firm. The first column shows the number of units of a variable factor of production employed by the firm. 
TABLE 13-2
-Refer to Table 13-2. This firm begins to experience diminishing marginal productivity when it hires the
Unit of the factor.
Definitions:
Psychoactive Drug
A substance that chemically alters brain activity, leading to changes in how we perceive things, feel, remain conscious, think, or act.
Sleeping Aid
A substance or method used to help an individual fall asleep or improve the quality of sleep.
Potent Stimulant
A substance that dramatically increases alertness, attention, and energy by stimulating the central nervous system.
Dangerous Stimulant
A substance that raises levels of physiological or nervous activity in the body, potentially posing health risks.
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