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Revealed preference methods

Revealed preference methods, which also come from the field of economics, focus on the choices people have made in related fields in order to estimate value. ‘Travel cost method’ is one example which looks at the time and travel cost expenses that people incur to visit a site as a proxy for their valuation of that site. Because travel and time costs increase with distance it’s possible to construct a ‘marginal willingness to pay’ curve for a particular site.