In 1988 services moved ahead of manufacturing as the main product of the United States economy. But what is meant by "services" ? Some economists define a service as something that is produced and consumed simultaneously, for example, a haircut. The broader, classical definition is that a service is an intangible something that cannot be touched or stored. Yet electric utilities can store energy, and computer programmers save information electronically. Thus, the classical definition is hard to sustain.
The United States government’s definition is more practical: services are the residual category that includes everything that is not agriculture or industry. Under this definition, services includes activities as diverse as engineering and driving a bus. However, besides lacking a strong conceptual framework, this definition fails to recognize the distinction between service industries and service occupations. It categorizes workers based on their company’s final product rather than on the actual work the employees perform. Thus, the many service workers employed by manufacturers— bookkeepers or janitors, for example—would fall under the industrial rather than the services category. Such ambiguities reveal the arbitrariness of this definition and suggest that, although practical for government purposes, it does not accurately reflect the composition of the current United States economy.
The author refers to "service workers employed by manufacturers" (highlight text) primarily in order to point out
如果按The passage suggests which of the following about service workers in the United States? A The number of service workers may be underestimated by the definition of services used by the government. 的思路来说的话，定位部分说明了有些服务业人员被归为工业了，所以人数会少，那么这个题不也是一样的吗，A选项正好说明了这一部分人员没有被归为服务业，不应该选A吗？
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