We use a large-scale personalized field experiment on Wikipedia to examine the effect of motivation on domain experts' contributions to digital public goods. In our baseline condition, 45% of the experts express willingness to contribute. Furthermore, experts are 13% more interested in...

We investigate the effects of team competition on pro-social lending activity on Kiva.org, the first microlending website to match lenders with entrepreneurs in developing countries. Using naturally occurring field data, we find that lenders who join teams contribute 1.2 more loans ($30–$42)...