Free riders or easy riders?: An examination of the voluntary provision of public radio

This paper tests the widely accepted hypothesis that when a pure public good is voluntarily provided incentives to free ride increase with the number of individuals consuming the good. Specifically, I use unique data on the number of listeners and contributors to public radio to test two hypotheses. First I test whether the proportion of contributors falls as group size increases and second I test whether contributions per contributor falls as group size increases. I find that increases in group size result in significantly more free riding. However, I also find that group size has no effect on contributions per contributor.