Tourism Supply - Measuring the Supply of Tourism           
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Roehl, W. 1998. The Tourism Production System: The Logic of Industrial Classification. In The Economic Geography of the Tourist Industry. Dimitri Ioannides and Keith G. Debbage (ed.), New York, Routledge: 53-76.

This book chapter describes the methods currently used to measure the production of the tourism industry using the Standard Industry Classification (SIC) and the modified North American Industry Classification System (NAICS). The limited focus on the the service industry meant that the SIC codification posed serious challenges for tourism researchers. The new NAICS classification system adopted in 1997 uses the production function as its organizing principle in grouping businesses into industries. The system is hierchical with industry grouped together into sectors. There is no tourism sector included in the NAICS, but a list of the NAICS codes that describe the tourism production system at the industry and US national industry level are provided.

Smith, S. L. J. 1995. Defining and describing tourism. In Tourism Analysis: A Handbook.Essex, Longman Group Limited, Second Edition: 20-41

This chapter describes the challenges with describing and defining tourism. In particular it focuses on defining tourism as a demand-side concept - from the perspective of the person taking the trip or supply-side - from the perspective of the business supplying the tourism product or service. A history of tourism definitions is presented as well as the current definition from the World Tourism Organization (WTO): "Tourism is the set of activities of a person travelling to a place outside his or her usual environment for less than a year and whose main purpose of travel is other than the exercise of an activity remunerated from within the place visited." On the demand-side tourism can be classified by such factors as length of stay, type of traveller, type of trip, type of expenditure, transport mode or accommodation type. On the supply-side, the tourism industry can be classified first by whether the business (or the whole industry type) does at least a certain percentage - usually 15% - of their business with tourists and secondly by the type of tourism product (e.g. passenger air transport, camping, recreation and entertainment). The Standard International Classification of Tourism Activities (SICTA) is also presented which is a globalized system for classifying and measuring tourism activity. It combines supply-side concepts - the basic structure is based on establishments - and demand-side concepts - establishments are selected according to the nature of their customers (e.g. the percentage of tourists)

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