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.

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.

Commission s influence on transaction currency ——Research on storage theory;

This article analyzed the transactional demand of business for foreign exchange of 25 sample-companies of the Hang Seng Index by establishing the theoretical models and the Event-Study Analysis.