This isn't quite true. I get what you're saying, but from a technical perspective, it's not accurate. The markets also go up based on the total money supply in the system. If the government takes on a lot of debt, eventually a portion of that makes its way to the stock market, among other places.
You don't actually need to improve efficiency/productivity if the government has tools like the discount rate, open market operations, the ability to alter margin requirements on derivatives, fed funds rate, as well as programs and policies like MMIF, TAF, CPPF, ABCP, TALF, ZIRP, to manipulate the money supply and the velocity/flow rates of money.
You don't actually need to improve efficiency/productivity if the government has tools like the discount rate, open market operations, the ability to alter margin requirements on derivatives, fed funds rate, as well as programs and policies like MMIF, TAF, CPPF, ABCP, TALF, ZIRP, to manipulate the money supply and the velocity/flow rates of money.