Incubators also differ from U.S. small business administration small business development centers (and similar business assistance programs) because they serve only selected clients. On July 7, 1953, the Small Business Administration was created in the Small Business Act. Its purpose is to “promote, advise, support and protect the interests of small businesses where possible.” In addition, the Charter ensures that small businesses will receive an “appropriate share” of all government contracts and the sale of surplus assets.  SBDCs work with every small company at every stage of development, not just start-ups. Many business incubaation programs work with their local SBDCs to create a one-stop shop for business support.  About one-third of incubation programs are sponsored by economic development organizations. Public bodies (for example. B cities or counties) account for 21% of the program`s sponsors. An additional 20% are subsidized by academic institutions, including two- and four-year colleges, universities and fachhochschulen.
 In many countries, incubaation programmes are funded by regional or national governments as part of a comprehensive economic development strategy. However, in the United States, most incubaation programs are independent, community-based and resource-related projects. The U.S. Economic Development Administration is a frequent source of funds for the development of incubst order programs, but once a program is open and operational, it generally does not receive federal funding; Rents and/or client costs account for 59% of the incubator`s revenues, followed by service contracts or grants (18%), and cash grants (15%).  There are a number of business incubators that have focused on specific sectors or business models and have given them their own name. Many for-profit or “private” incubator programs were launched in the late 1990s by investors and other for-profit operators, who wanted to move quickly and make big profits. At the time, NBIA estimated that nearly 30% of all incubation programs were for-profit enterprises. However, as a result of the bankruptcy of dotcom, many of these programs were closed. In the 2002 NBIA survey of the state of business start-up, only 16% of the business incubators surveyed were for-profit programs. At THE 2006 SOI, only 6% of respondents were profit-oriented.  The U.S.-based International Business Innovation Association estimates that there are approximately 7,000 business incubators in the world.
A study funded by the European Commission in 2002 identified some 900 incubation environments in Western Europe.  As of October 2006, there were more than 1,400 business incubators in North America, up from just 12 in 1980. In 1997, Her Majesty`s Treasury identified some 25 incubation environments in the United Kingdom; Until 2005, ukBI identified about 270 incubation environments across the country. In 2005, North American incubator programs supported more than 27,000 companies employing more than 100,000 workers and generating annual sales of $17 billion.  More than half of all business incubaation programs are mixed-use projects, that is, they work with clients in a wide range of industries. Technology incubators account for 39% of incubator programs.  A business incubator is a company that helps new businesses and start-ups grow by offering services such as management training or offices.  The National Business Incubation Association (NBIA) defines business incubators as a catalyst for regional or national economic development. NBIA ranks its members` business incubators according to the following five business incubators: academic institutions; Not-for-profit development companies; for-profit real estate development projects; Venture capital firms and the combination of the companies mentioned c