Tourism products and services have been made available through intermediaries, although tourism providers (hotels, airlines, etc.) can sell their services directly. This has put pressure on intermediaries from both online and traditional shops. It has been suggested there is a strong correlation between Tourism expenditure per capita and the degree to which countries play in the global context. Not only as a result of the important economic contribution of the tourism industry, but also as an indicator of the degree of confidence with which global citizens leverage the resources of the globe for the benefit of their local economies. Space tourism is expected to "take off" in the first quarter of the 21st century, although compared with traditional destinations the number of tourists in orbit will remain low until technologies such as a space elevator make space travel cheap. Hope this book will be useful to students as reference book and will be a priced collection for their own library.