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John is an athlete. He has $120 to spend and wants to buy either a heart rate monitor or new running shoes. Both the heart rate monitor and running shoes cost $120, so he can only buy one. This illustrates the principle that

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ecadrobe

Answer:

a scale of preference has to be drawn.

Explanation:

This is an economic concept where a choice is made between two or more items based on the order of importance.

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