Any long-term analysis of science parks in the United Kingdom reveals a number in older industrial cities that have been absorbed by neighbouring universities or converted into generic business and office space, whilst some of the more successful ones have been located in local economies that were booming before the formation of the park (Surrey is a good example). In the case of Sweden, Lofsten and Lindelof (2002) found that for new technology-based firms (NTBFs), those based in science parks had a higher rate of employment and sales growth than comparative NTBFs which were not located in parks. There was, however, no clear relationship with firm profitability.