It takes brothers John and Dan the same amount of time to clean the room they share, but John can mow the lawn faster than Dan. Which action would allow them to take advantage of their respective comparative advantages?

Comparative advantage means each person should focus on the task they can do at a lower opportunity cost. John and Dan take the same time to clean the room, so neither has an advantage at cleaning; John is faster at mowing, so mowing is where he has the advantage. John should mow while Dan cleans, which is choice B.

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