Price comparison sites and their influence on e-commerce processes

Customers often use environment price comparison sites (e.g., heureka.cz, or zbozi.cz) when they want to buy some product or service over the Internet. These sites help them while searching of some product, give them an overview on prices, and also affect consumers' perception of the risks associated with online buying. The purpose of our paper is to suggest a model which would explain basic processes of online shopping environment with the tools of network analysis. We look at the relation of shoppers and e-shops as bipartite network. Our paper should answer following questions as: What communities are forming and how? Can we determine conditions on network topology? We use simulation data for this purpose, and compare results with data from other resources.