Olivier Baron Univ. Bordeaux, CNRS, INRAE, BSE, UMR 6060, UMR 1441   Université de Bordeaux Campus Montesquieu - H2 Ave Léon Duguit Pessac, 33608 France   olivier.baron@u-bordeaux.fr             JEL Areas: Q0 : Agricultural and Natural Resource Economics; Environmental and Ecological Economics: General O : Economic Development, Technological Change, and Growth