This graph illustrates the work of psychologists Harvey Whitehouse and Quentin Atkinson, as published in the April

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Question:

This graph illustrates the work of psychologists Harvey Whitehouse and Quentin Atkinson, as published in the April 23-29, 2011 issue of The Economist. The "unpleasantness" of religious rituals (0 is low, 5 is high) is along the x-axis. How often the religion requires the ritual to be performed is along the y-axis. What economic concept does this diagram represent?

A. consumer surplus
B. an inferior good
C. opportunity cost
D. a demand curve