Juanita is training for a triathlon, a timed race that combines swimming, biking, and running. Consider the following sentence: In order to swim for an hour, Juanita must take time away from work, where she earns $10 per hour. This is in addition to paying a $5 entrance fee for the pool.   Which basic principle of individual choice do these statements best illustrate? People usually exploit opportunities to make themselves better off.   Markets are usually a good way to organize economic activity.   The cost of something is what you give up to get it.   Trade can make everyone better off

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