We develop a practical model of optimal control on stochastic inventory system by considering the time-limited free backorders,which is usually a common phenomenon in the practical inventory activities,and the impact on optimal inventory law of stochastic factors,e.

According to the theory of service quality management,relationship of service quality,customer value,satisfaction,customer expectation and loyalty are analyzed with the empirical research of customer s behavior in auto-market.

By expert suggestions,durable goods should be priced considering customer expectation of price and their cost in open electronic commerce.

Customer expectation is a desire for service behavior and service performance by customer.