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well read the link
but still not clear
have some questions
talking about scope of the argument,
1) how can US be taken as only metropolitan cities. does the vacationers come to the cities only. why not towns, villages and coastal areas.
2) nothing is mentioned about the origin of vacationers,then how can one assume that the local population is vacationers in case of pure aquarium, but local residents in case of zoo. (hong hu how can you assume this)