According to the goals of maximization for selling revenue and profit, this paper, using the concept of price elasticity and cross elasticity of demand, sets up mathematical models for the price adjustment of relative products.

Having been emphasized by economists and anti-trust law enforcement agencies,the method of defining relevant market falls into three main categories:the method of cross-price elasticity of demand,the method of transportation data;and the method of SSNIP.

Focuses on the new economic phenomena existing in the knowledge economy,especially analyses the two reasons which cause the phenomena of increasing marginal utility:the repeatable demands and the crossing demands.

Analysis of Chinese tea price in Morocco market and its demand elasticity;

Effect of demand elasticity on generation system reliability;

The Evaluation of Service Demand Elasticity in China Based on Baumol Model;

Based on market power theory of industry histology,the causes of formation of market power of Chinese pharmaceutical industry were analyzed from multiple angles such as demand flexibility,market structure,vertical conspiracy,system facet and so on.