Based in concepts and models of “commercialization”, this work has asobjective to analyze the transmissions of prices … between producer, attacked and retailof the productive chain of the beans in the state of the Paraná, in the period of 1995 … indicating of efficiency in the distribution and commercialization of the product. In general way, the retail caused variations …

urban areas. This paper analyzes the structure and performance of the beans marketing system in Nairobi metropolitan area … results showed that the beans marketing structure approached that of pure competition; however, lack of capital was a barrier …Beans are widely grown as a major food crop in Eastern and Southern Africa. It is the most important staple food crop …