Which of the following is a secondary reinforcer?

• A. Money
• B. Food
• C. Water
• D. Sleep

Answer: (A)

A secondary reinforcer is something whose power to reinforce behavior comes from what it represents, not from directly meeting a biological need. Money fits this idea because it doesn’t directly satisfy hunger, thirst, or sleep. Instead, it has value because we’ve learned that it can be exchanged for things that do meet those basic needs. Through social learning and experience, money becomes a cue for obtaining primary reinforcers like food, water, or rest, so it strengthens behaviors that lead to earning or using it. In contrast, food, water, and sleep are primary reinforcers because they directly satisfy biological needs without needing prior learning to be reinforcing.