Just to drive the point home, the chart below presents the same historical relationship in Japanese data over the past two decades. One wonders why anyone expects quantitative easing in the U.S. to be any less futile than it was in Japan.
Simply put, monetary policy is far less effective in affecting real economic activity than investors seem to believe. The main effect of a change in the monetary base is to change monetary velocity and short term interest rates. Once short term interest rates drop to zero, further expansions in base money simply induce a proportional collapse in velocity.
I should emphasize that the Federal Reserve does have an essential role in providing liquidity during periods of crisis, such as bank runs. Undoubtedly, we would have preferred the Fed to have provided that liquidity in recent years through open market operations using Treasury securities, rather than outright purchases of the debt securities of insolvent financial institutions, which the public is now on the hook to make whole. Regardless, when liquidity constraints are truly binding, the Fed has an essential function in the economy.
At present, however, the governors of the Fed are creating massive distortions in the financial markets with little hope of improving real economic growth or employment. There is no question that the Fed has the ability to affect the supply of base money, and can affect the level of long-term interest rates given a sufficient volume of intervention. The real issue is that neither of these factors are currently imposing a binding constraint on economic growth, so there is no benefit in relaxing them further. The Fed is pushing on a string.
Toy blocks
Certain economic equations and regularities make it tempting to assume that there are simple cause-effect relationships that would allow a policy maker to directly manipulate prices and output. While the Fed can control the monetary base, the behavior of prices and output is based on a whole range of factors outside of the Fed's control. Except at the shortest maturities, interest rates are also a function of factors well beyond monetary policy.
Analysts and even policy makers often ignore equilibrium, preferring to think only in terms of demand, or only in terms of supply. For example, it is widely believed that lower real interest rates will result in higher economic growth. But in fact, the historical correlation between real interest rates and GDP growth has been positive - on balance, higher real interest rates are associated with higher economic growth over the following year. This is because higher rates reflect strong demand for loans and an abundance of desirable investment projects. Of course, nobody would propose a policy of raising real interest rates to stimulate economic activity, because they would recognize that higher real interest rates were an effect of strong loan demand, and could not be used to cause it. Yet despite the fact that loan demand is weak at present, due to the lack of desirable investment projects and the desire to reduce debt loads (which has in turn contributed to keeping interest rates low), the Fed seems to believe that it can eliminate these problems simply by depressing interest rates further. Memo to Ben Bernanke: Loan demand is inelastic here, and for good reason. Whatever happened to thinking in terms of equilibrium?
