In developing countries, common property resources (CPRs) can be an important source of income for certain individuals within households. This paper demonstrates that if a change in the management of CPRs imposes costs on these individuals, or causes a decline in the prices or productivities associated with goods produced from the CPRs, the intrahousehold allocation of resources may alter in a manner detrimental to those individuals. The paper also shows that the assumption of a unitary household model causes the detrimental effects of certain CPR policy interventions to be overlooked.