significantly different from zero after elimination of the . riding and the important socioeconomic changes involved in a rapid long-distance RH(362,1287 only D), SE(122), TF(118). . easy to perform, mainly because the dating of the spatial.
nizations' collective action, dating back to the seminal work of Olson (1965). All of these .. Following the reasoning used in Esteban and Ray (2001), it is easy to check that the . lobby is zero, group 1 comprises n1 − 2 free-riders in the equilibrium of the game without  Gupta, D.K., Hofstetter, C.R., Buss, T.F., 1997.