Open AccessThe spectacular development in air technology during and since the Second World War, and a parallel economic growth, have been responsible for a tremendous increase in international tourist statistics, making tourism the world's largest industry. For the sake of clear international definition, a tourist is regarded as a person who visits a country other than his country of normal residence, for any reason other than being gainfully employed within the country he visits. During 1975 such tourist arrivals numbered 213 million, and the receipts from international tourism amounted to US $32 000 million. Domestic tourism also plays an important role in most countries. It is the rule rather than the exception that the local tourist creates the demand for the development of amenities, which can then cater for the tourist from abroad.