Nonprofit organizations produce a range of goods and services from the
purely public to the purely private. Within the two extremes fall a m
ajority of their outputs. This article explores the question of what d
etermines a nonprofit's mix of goods. It first develops a method to me
asure the product mir of charitable nonprofit organizations. A testabl
e model is then offered and applied to a national database consisting
of tax returns filed with Internal Revenue Service by tax-exempt chari
table nonprofits. The results indicate that the output mix can be expl
ained by institutional characteristics, types of activity, and communi
ty-based factors. The article concludes with a discussion of whether,
given the evidence, public subsidies to charitable nonprofits should b
e based on the outputs these entities produce.