Título: In public goods more is more.
Abstract: We present an experiment where participants can distribute a given endowment between a private project and one or more public goods. Some of those public goods are designed in such a way that none of them provides higher profit for all possible levels of contribution. Consequently, we assume that a significant portion of the sample will not have complete preferences in regard to the public goods. We seek to determine whether this lack of preference may lead to lower contributions than if only one public good is available or if, by contrast, it may increase contributions to public goods. Our findings suggest that if the habit formation effect is controlled, the presence of conflicting public goods encourages contribution while dominated public goods do not affect it.