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With global revenues of an estimated $2.8 trillion, the healthcare industry is the world's largest industry.  Today over 80 million Americans are employed in the service sector and as much as 70% of the U.S economy is service oriented. The US service industry is very technical and sophisticated; comprising of computer and software development, business consultancy, telecommunication, banking, finance and insurance. This pattern of economic development is not universally applicable to all the countries. In many African and Asian countries, the agricultural sector is still the dominant one.

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