The recent rise of low-cost airlines in Country Y has led to great increases in the number of air travelers and flights. However, a “hidden cost” of flying and certain other forms of travel is the significant amount of air pollution, which contributes to global warming. To make people pay these hidden costs-and in the process discourage the explosive growth in flying-the government of Country Y plans to impose fees on all air travel. There is a problem, however, in that many residents of Country
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