Consider five individuals with different occupations. 
Which of the following pairs of individuals has a double coincidence of wants?
Definitions:
Prototype
An original model or first form of something from which later versions are developed or copied.
Higher-order Conditioning
A learning process in which a conditioned stimulus is paired with a new neutral stimulus, creating a second (often weaker) conditioned stimulus.
Secondary Reinforcers
Stimuli that have become reinforcing through association with primary reinforcers; they do not satisfy biological needs but often hold value, such as money or praise.
Concepts
General ideas or understandings that can be used to group together objects, events, qualities, or abstractions that are similar in some way.
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