Using Monte-Carlo simulation, , we compare the most popular demand systems including the LES, AIDS, BTL, QES, QUAIDS and AIDADS, and find that different models actually have different advantages in estimating different elasticities. Specifically, QES, AIDS and AIDADS models are the best in...

Contracts are widely used by agricultural processors for purchasing inputs not only in developed countries but also in developing countries such as China. The total number of formal, written contracts between farmers and food processors is increasing rapidly in China, and the formal contracts...

Another version will replace the current draft