Observing that people who wish to engage in prosocial behavior are often presented with more than one means to the same end, we develop a model in which agents may contribute to a single public good through a range of different activities. We use this model to make two points. First, noting that...

People can often contribute to prosocial causes by several means; for instance, environmentally friendly activities include sorting household waste, buying organic products, and donating to NGOs. Policy to encourage prosocial behavior is sometimes directed only towards a particular activity,...