According to p. Kotler, the service is a kind of product/market specifically, there are distinct characteristics compared with tangible products and is understood as any act or performance that one party can offer to another party and has the amorphous nature, does not result in ownership of whatever production they can independently or in association with tangible products. Nguyen Bach Khoa (2013) said that not all of the action is the service that only the "effective utility" (utility effects) of its new product created and introduced the concept of universal service is the effective utility of a labour activity provided by your salesman for the organizations and individuals targeted beneficiary may be paid or free to satisfy the needs, wishes and their determination. Therefore, the service has always been characterised by the general nature is its amorphous, non-transfer of ownership, not the reserves are, not divided between producer and consumer, availability of variable structure and product quality.
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