在美国，三种职业需要消费：服务员、出租车司机和理发师。
In America, the three basic occupations that require tipping are waiters/waintresses, taxi drivers, and barbers.
一些经济学家把服务定义成生产和消费同时进行的行为，例如理发。
Some economists define a service as something that is produced and consumed simultaneously, for example, a haircut.
一些经济学家把服务定义成生产和消费同时进行的行为，例如理发。
Some economists define a service as something that is produced and consumed simultaneously, for example, a haircut.
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