1. Department of Environmental Economics and Management, Hebrew University of Jerusalem, Mount Scopus, Jerusalem (e-mail: )
2. Department of Economics, University of Warwick, Coventry, CV4 7AL, United Kingdom and Department of Economics, The Hebrew University, Jerusalem, Israel (e-mail: )
3. Department of Geography and Environment, London School of Economics and Political Science, London, WC2A 2AE, United Kingdom (e-mail: )