Passage Summary: Most money spent on vacation in developing countries leaves the country, and this gets worse as the area becomes a popular hotspot, unless tourists make an effort to pay local people directly.

Reasoning: Most tourism profit in developing nations goes to foreign owners; this trend intensifies as destinations mature; however, tourists can mitigate this by buying services directly from locals.

Analysis: We are looking for a statement that must be true based on the provided facts. We know there is a general trend of increasing 'exported' revenue as a destination becomes established, but we also have a 'counteracting' factor: direct local purchasing. Therefore, if a tourist chooses to buy locally in an established destination, they are reducing the amount of profit that would otherwise be sent to foreign owners. Look for an answer that synthesizes these points, likely suggesting that local purchasing is a way to keep more money in the local economy than the standard 'established' model allows.