We present an intertemporal equilibrium model for fossil fuels, and st
udy the effects on oil prices, extraction paths and oil wealth of an i
nternational carbon tax on fossil fuel consumption Our conclusion is t
hat a carbon tax will hurt OPEC more than other producers, as the cart
el is induced by its market power to restrain production in order to m
aintain the oil price. Thus, the effects on the oil wealth of the comp
etitive fringe are minor, while OPEC's wealth is considerably reduced.
We also show by applying a competitive model that this result is due
to market structure, and not to differences in the resource base.