A considerable body of literature exists on WTP for various
types of outdoor recreation facilities. Most research on and
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experience of entrance fees comes from the United States, where
federal recreation fees have been applied since the early 20th
century (Sharpley & Sharpley, 1997). It should be noted that
studies on WTP vary greatly in their context and the comparability
is therefore limited in many cases. Many studies on
outdoor recreation mention ‘user fees’ in a general sense (i.e. they
may include fees for facilities as well as services). In addition,
some studies explore the implementation of new fees and others
increased levels of existing fees; these may evoke different
responses. However, for the sake of simplicity, the economical
mechanisms behind these different types of fee programmes are
regarded as being roughly the same.