The spatial dimension of most agricultural raw product markets (e.g., milk) and the high concentration of food processors facilitate the exercise of market power towards farmers. In the milk sector, processors that are investor-owned firms (IOFs) compete alongside processing cooperatives (COOPs)...

We develop a product-differentiated model where the product space is a network defined as a set of varieties (nodes) linked by their degrees of substitutability (edges). We also locate consumers into this network, so that the location of each consumer (node) corresponds to her "ideal" variety....