This observation is as true about an individual as it is about a place, whether the place is a neighborhood, a town, a state or province, or a country. Every town has grocery stores, beauty parlors, gas stations, and movie theaters that serve the local community.
这项原则既适用于人也适用于特定地域，无论该地域是社区、城镇、州、省、还是国家。每座城镇都有服务于当地民众的杂货铺、美容院、加油站和电影院。经济学家称这些为“非贸易活动”，因为它们不以服务远程客户为目的。