In 1958, the average lifespan of an S&P 500 company was 61 years. These days it's down to 15 years, because capitalism consumes like fire:
The line that government is wasteful and business is efficient flies in the face of evidence. Federal and state governments have all outlasted Sears, K-mart, Enron, Worldcom, Toys-R-Us, Howard Johnson's, Woolworths, TWA, Revlon, Lehman Bros, AIG, Bed Bath and Beyond... GM and Texaco went through bankruptcy.