In order to break the assumptions of theoretical model, and make the theory more applicable,ults will follow, starting from the market forecast, and with its results used as the reference for calculating annual demand, this thesis calculated the economic lot size by positive research.

According to these three cases,mathematical model was set up and the problem of assuring economic lot size and the minimum inventory costs could be solved.

The main goal of this paper is to study solution algorithm of economic lot size problems with perishable inventory,basis studying in now available document,calculate amounts big shortcomings,giving that one kind a genetic algorithm specifically for the heuristic method algorithm in the past searching for.

In order to reach the target of maximizing overall value on supply,this article studies and explores economic order quantity and cost from multiple aspects.

In the study on economic order quantity of unequal requirement,a computing formula of economic order quantity used in the course of “t” at supplying goods can be worked out by taking average stock into account.

Models of economic quantity are discussded.

The paper investigates model parameter dynamic affection to quantity and store cost, with the sensitivity analysis of basic economic quantity model, and provides an effective access to reasonable adjustment of order quantity and saving flow capital occupation.

In the second chapter,we consider a two-echelon dynamic lot-sizing problem about a distribution center and a retailer where the distribution center stipulates a minimum order from the retailer.

In this paper,we consider a two-echelon dynamic lot-sizing problem about a distribution center and a retailer where the distribution center stipulates a minimum order from the retailer.

During this process,economic principle and exterior factors such as network and the public media added fuel to the fire,and pushed the network language forward healthily.

Based on the pioneers researches into the interrogative level,this paper further investigates the meanings of question in particular,and represents its two major components: the interrogative level and the interrogative scope and their source in terms of the economic principle of language,the information content questions and the yes-no answer.

The economic principle of least efforts and the communication principle of dynamic contextual adaptation explain the process of the phenomenons decoding.