Nonprofits are unique. In addition to having the ability to generate earned income, they raise contributed income to support their organizational mission. The premise behind a nonprofits' tax exempt status is that the nonprofit exists for public benefit and therefore requires an accounting and capital structure that differs from standard business enterprises. In order to encourage individuals and organizations to support the nonprofit community's provision of public goods, monetary gifts to charitable organizations are tax deductible. Contributed income, for most nonprofits, is an essential component of the revenue mix. It is often proactively solicited through annual campaigns, capital campaigns, special events, sponsorships, and ongoing fundraising initiatives. The individual and institutional givers who make charitable contributions do not receive nor expect goods and services in return.