It makes an investigation on semantic features of each subcategory,and concludes the choice and constraints for "A_单" semantically in the structure "A_单+着(zhe) "The third chapter studies the development course of the structure "A_单+着(zhe) " in diachronic view,and divides the course into three periods:Sprout period, stereotyped period and the development period.

Mechanism Design for SOPR Transfer: Based on Firm-Employee Contract Choice;

The system of "One Project One Discussion" shows a kind of contract choice relation between village committee and villagers.

The study mainly from three points of view such as "New Institution Economics Theory","Behavior Economics Theory" and "Contract Theory" to investigate the inherence logics between contract choices and farmer s quality control behavior and these relationships would effect the food safety problem.

The authors use the transaction cost theory to explore the factors which affect the contract choice of enterprises and peasant households and build a model for a quantitative analysis of these factors.

To maximize the profit rate of security portfolio and minimize the investment risk measured by β,diversification selection constraints can be used to counteract the non-system risk.