This article summarises the main results of entrepreneurship theories of the non-profit sector and discusses the impact they may have on theory development and on the real world non-profit sector. It is pointed out that the entrepreneurship approach advances our knowledge of the non-profit sector, especially by stressing the supply-side aspect and by focusing on the preferences individuals must have in order to engage in non-profit activities. There is empirical evidence consistent with entrepreneurship theories. Yet most observations do not exclusively support entrepreneurship theories but also provide evidence consistent with other economic theories of the non-profit sector. This illustrates that the various economic theories of the nonprofit sector are more complements than substitutes. Furthermore, entrepreneurship theories indirectly help to improve the image nonprofit organisations have in the real world; therefore they play a prominent role in teaching programmes which have been established to train non-profit managers.

This article evaluates economic theories of the non-profit sector by their ability to enlighten our understanding of the scope of inquiry, the determinants of the size and scope of the non-profit sector, and the behavioural responses of donors, volunteers, paid staff and non-profit organisations to changes in their external environment. Adherence to a non-distribution constraint has proven to be a useful way of delimiting economic analysis of non-profit organisations, but more attention should be paid to alternatives. Economists have been less successful at developing usable distinctions between voluntary action and exchange. The size and scope of the sector appear to be determined by entrepreneurial supply factors, donations (which in turn are influenced by tax policy, governmental spending, fund-raising, and the quality and mixture of organisational outputs, commercial or charitable), commercial activities, capital supply, the supply of labour (paid and volunteered), the marketability of outputs, and the distribution of consumer characteristics. Variations of James's (1983) model have proven useful to predict the reaction of non-profits to exogenous changes.