This paper argues that the technology of Grid computing has not yet been adopted by enterprises due to the lack of viable business models. While in academia, Grid technology has already been taken up, the sharing approach among non for-profit organizations is not suitable for enterprises. In this paper, the idea of a Grid market is taken up to overcome this Grid adoption gap. Although this idea is not new, all previous proposals have been made either by computer scientists being unaware of economic market mechanisms or by economists being unaware of the technical requirements and possibilities. This paper is unique as it derives an economically sound set of market mechanisms based on a solid understanding of the technical possibilities.