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The computing grids make possible to use a huge computing power by aggregating the power of several isolated resources. This concept evolved especially on the idea of resource virtualisation. It is within this framework that we were interested in service oriented grids. We privileged the economic-based resource allocation models. We study the scheduling through a service oriented and market oriented grid. We proposed an architecture for the grid to articulate the different compounds: the consumers, the supplier of services and the brokers. We proposed three algorithms for brokers of grid in order to control the demand an the supply of services on the market where the brokers was in concurrence. We finally compared the three proposals.