Eric is training to run a marathon. Consider the following sentence: Eric has only 20 hours per week that he can devote to training for his race.   Which basic concept of individual choice does this sentence best illustrate?

Economics Today and Tomorrow, Student Edition
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Chapter1: What Is Economics
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Eric is training to run a marathon.
Consider the following sentence: Eric has only 20 hours per week that he can devote to training for his race.
 
Which basic concept of individual choice does this sentence best illustrate?
People usually exploit opportunities to make themselves better off.
 
A. Resources are scarce.
 
B. All costs are opportunity costs.
 
C. Many decisions are made on the margin.
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The point is that Eric has only 20 hours per week that he can devote to training for his race.

 
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