A knowledge economy include the concept of exchanging knowledge-based products and services. However, as discussed by Stewart (1996) knowledge is very different from physical products. For example, it can be in more than one place at one time, selling it does not diminish the supply, buyers only purchase it once, and once sold, it cannot be recalled. Further, knowledge begets more knowledge in a never-ending cycle. Understanding of knowledge markets is beginning to emerge. As would be expected, they are very different in form from traditional markets.