FOR all its current economic woes, America remains a beacon of entrepreneurialism. Between 1996 and 2004 it created an average of 550,000 small businesses every

FOR all its current economic woes, America remains a beacon of entrepreneurialism. Between 1996 and 2004 it created an average of 550,000 small businesses every month. Many of those small businesses rapidly grow big. The world's largest company, Wal-Mart, was founded in 1962 and did not go public until a decade later; multi-million dollar companies such as Google and Facebook barely existed a decade ago.