Bouwe Dijkstra University of Nottingham   School of Economics University of Nottingham Nottingham, NG7 2RD UK   bouwe.dijkstra@nottingham.ac.uk   http://www.nottingham.ac.uk/economics/staff/details/bouwe_dijkstra.htm           JEL Areas: Q5 : Environmental Economics: General L1 : Market Structure, Firm Strategy, and Market Performance: General