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This paper extends the framework of Green and Porter (1984) and Porter (1983a) to nest the case of a cartel (OPEC) faced by a competitive fringe (non-OPEC oil producers). Estimation of a simultaneous equation switching regression model allows us to examine which market structure better characterizes the world oil market during the 1974-2004 period and to test whether switches between collusive and noncooperative behavior occurred. The null hypothesis that no switch occurred is rejected in favordoi:10.1093/oxrep/grr007 fatcat:nmwpcpyv6fbglkedpnrabhix4i