A split-sample approach is employed to test three potential design options for contingent valuation studies. A survey of unpriced woodland recreation is undertaken to test: (a) the impact of introducing budget-constraint questions; (b) the effect of varying temporal extent from willingness to pay (WTP) per annum to WTP per visit; and (c) the consequences of varying the order in which such WTP questions are presented to respondents. Some significant design effects are detected. Alternative explanations of such findings are considered and implications discussed.
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Bateman et al. (1997) studied this question.
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