Estimates are given of the numbers and floor areas of all nondomestic premises in England and Wales, as of 1993/94. These are based on a wide range of data sources, of which the most important are commercial rating (property taxation) data collected by the Valuation Office of the Inland Revenue. Information has also been collated from a large number of publications and databases produced by commercial firms, central and local government departments, and professional and trade organisations. A new hierarchical classification of activities is employed, called here the primary classification. This has been developed out of a series of existing schemes by which the original data are themselves classified.
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Bruhns et al. (2000) studied this question.
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