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Service (economics) - Wikipedia
Service Economy: Definition, Characteristics, Pros and Cons
Service economy - Wikipedia
Service Sector: Place in Economy, Definition and Examples - Investopedia
Service: Definition, Concept, Characteristics, Importance and ...
服务经济 - MBA智库百科 - MBAlib.com
服务经济学 - MBA智库百科
Service (economics) - Simple English Wikipedia, the free …
服务经济学 - sklib.cn
Service in Economics | Definition & Examples | Study.com