As for the requiring function, the definitions of the self-priced elasticity,cross price elasticity as well as income elasticity have been given with the help of partial derivatives.

The Guiding Effect of Demand Cross Elasticity to Market driven Economy;

Then the passenger transferring volume among different traffic modes is conducted by the cross elasticity analysis under different development policies.

Self and cross price elasticity,which had effects on farmers ability-to-pay,and the changes of elasticity coefficient with income compensation were analyzed.

The price elasticity of medical demand in middle -economic -level areas was analyzed during 1991-1998 in this paper.

Under the demand with price elasticity of final market, the optimal price discount contract consisted of single-manufacturer and single-retailer in the international supply chain is studied in this paper.

This paper investigates two-level inventory systems consisting of several venders and several retailers,establishes inventory models separately for the vendor and the retailer with price discount or not,while market demand has price flexibility and short supply is permitted.

Under the demand of price flexibility, the paper develops a general profit maximization model for single period two product substitution problem.

These kind of products have a more complicated demand feature and demand price flexibility than material products and media products that only have economic property or political property.