Grid computing describes a computing model that distributes processing across an administratively and locally dispersed infrastructure to create virtual supercomputers at low cost. However, currently Grids are mainly employed within enterprises to connect internal divisions and business units. This paper attempts to explain why Grid market initiatives have failed. The explanation mainly focuses on the object traded in Grid markets. What is needed to extend Grid technologies beyond company borders is a set of mechanisms that enable users to discover, negotiate and pay for the use of Grid services on demand. This paper derives a roadmap for the design of market mechanisms based on a solid understanding of the technical possibilities. This roadmap underlines the need for a catalogue of market mechanisms to increase the impact of Grid markets in commercial settings.
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