 We should thus ask: is voting more like the first kind of activity, in which it is only imperative that enough people do it, or the second kind, in which it’s imperative that everyone do it? One difference between the two kinds of activities is what abstention does to others. If I abstain from farming, I don’t thereby take advantage of or free ride on farmers’ efforts. Rather, I compensate them for whatever food I eat by buying that food on the market. In the second set of cases, if I freely walk across the lawn while everyone else walks around it, or if I enjoy police protection but don’t pay taxes, it appears I free ride on others’ efforts. They bear an uncompensated differential burden in maintaining the grass or providing police protection, and I seem to be taking advantage of them.