Due to increased competition,  accelerated changes in market demand, while the product market life cycles shorten, delivery time required improved, products begin to develop for many varieties, small batch. those old competitive factors has evolved a necessary condition for maintaining the competitiveness of enterprises, core element of competition has gone from providing low cost, high quality and good after-sales service into a "speed", competition among enterprises has evolved into the competition between supply chains. Under the same conditions, the sooner companies can respond to customers, the shorter lead-time to provide products, so the stronger viability, the more they get advantage in the competition.

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