Incubators also differ from the U.S. Small Business Administration's Small Business Development Centers (and similar business support programs) in that they serve only selected clients. Congress created the Small Business Administration in the Small Business Act of July 30, 1953. Its purpose is to "aid, counsel, assist and protect, insofar as is possible, the interests of small business concerns." In addition, the charter ensures that small businesses receive a "fair proportion" of any government contracts and sales of surplus property. SBDCs work with any small business at any stage of development, not only startup companies. Many business incubation programs partner with their local SBDC to create a "one-stop shop" for entrepreneurial support.