… is from page 181 of Arnold Kling’s and Nick Schulz’s 2009 volume, From Poverty to Prosperity:
Much of the innovation in the world comes from American business. Much of America’s innovation in turn comes from entrepreneurs. Entrepreneurs are the heart that pumps innovation into the economy. The dynamism and faster growth of the U.S. economy relative to other industrialized countries in recent decades is due to its strong entrepreneurial heart.
