What is the impact of small firms in driving innovation in the United States?

The U.S.Department of Commerce found that since World War II,small entrepreneurial firms have been responsible for half of all innovation and 95 percent of all radical innovation in the United States.Other studies showed that research and development at smaller entrepreneurial firms were more productive and robust than at large firms;smaller firms generated twice as many innovations per R&D dollar spent as the giants,twice as many innovations per R&D scientist as the giants,and 24 times as many innovations per R&D dollar versus those large firms with more than 10,000 employees.