Some Problems in Estimating the Demand for Outdoor Recreation

The Knetsch and Cesario comment is valuable be-cause it encourages thinking about how rec-reationists make decisions. Knetsch and Cesario take issue with my result that the cost of total time, not simply the cost of travel time, be added to the per unit travel costs of a trip. In their comment, Knetsch and Cesario raise two basic issues. (a) A more realistic model would per-mit time on site to vary as per trip costs vary. (b) In a two-stage decision-making process, the rec-reationists choose first the amount of time per activity and second at which site to participate in the activity. Knetsch and Cesario assert that in such a framework time spent on site is considered fixed and hence not part of the costs of recreating. I