Contracts Negotiation in Market Environments Taking into Consideration the Strength of Each Economic Player

The aim of the work is to present the model of the mediator, which takes into consideration the strengths of the different entities in a market. The theoretical background of the mediator is an economic model called Porter’s five forces. The mediator is a part of the developed environment for the analysis of strategies of the enterprises functioning on the market and constructing the supply chains. In the paper we present, in a short form, this environment and its functionality and describe the negotiation model and results obtained thanks to it.