This document summarizes research on the commercialization of the nonprofit sector in England/Wales and the United States. The research finds that:
1) Commercial revenue partially replaces donations as a source of revenue for nonprofits in both countries.
2) Commercial and donation revenue are interdependent, with an increase in one associated with a decrease in the other.
3) Commercial revenue crowds out donations, though this effect was only measured in the US. The degree of crowd-out varies between fields.