First, while there are four main approaches, the tourism studies that is developing in higher education tends to be crystallising around the business interdisciplinary approach ... Second, on account of the relative strength of the business of tourism, because of the increasing importance of [extradisciplinary] knowledge and because of the power of the performativity principle ... the business world of tourism is pushing out at the expense of other parts ...
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John Tribe (2005) studied this question.
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