INTRODUCTION What are the mechanisms through which Federal Reserve policy affects the economy? And has financial innovation in recent years affected the monetary transmission mechanism, either by changing the overall impact of policy or by altering the channels through which it operates? These were the questions examined by the conference Financial Innovation and Monetary Transmission, sponsored by the Federal Reserve Bank of New York on April 5 and 6, 2001.1 Our goal in this overview is to summarize the conference papers and distill from them some tentative answers to the questions posed at the outset. The overall conclusion drawn from the research presented is that monetary policy appears to have less of an impact on real activity than it once had-but the cause of that change remains an open issue. The conference papers explored three hypotheses en route to that finding. First, the transmission mechanism may have changed as a result of the financial innovations that motivated the conference, such as the growth of securitization, shifts between sources of financing for residential investment, or changes in the strength of wealth effects. Second, a change in the conduct of monetary policy may explain what appears to be a change in the effectiveness of policy. Finally, the fundamental structural changes affecting the economy's stability (and by implication, monetary transmission) may be nonfinancial in nature. Also emerging from the discussions was the consensus that a useful area for future research is to determine more precisely the role of each hypothesis in the evolution of the monetary transmission mechanism. Negative findings are often as informative as positive ones, however, and the conference succeeded in identifying three areas where financial innovation has left the monetary transmission mechanism largely unchanged. The first of these areas is the reserves market, which has changed profoundly in recent years as lower reserve requirements, higher vault cash holdings, and innovations such as sweep accounts have dramatically reduced the size of aggregate reserve balances. Yet despite these changes, the Fed has retained its ability to influence overnight interest rates-and indeed has generally succeeded in keeping the effective federal funds rate closer to its target than in years past. Changes in the reserves market therefore may have had a significant effect on the day-to-day implementation of policy, but they have not diminished the Trading Desk's leverage over shortterm interest rates. Second, there is no evidence to suggest that the quantitative importance of the wealth channel has changed much in recent years. Its contribution to the impact of monetary policy has always been modest, and that contribution has, if anything, decreased somewhat since 1980. Third, while the parallel trends of financial consolidation and globalization have had a dramatic impact on financial services industries, thus far the trends appear to have had no perceptible effect on monetary transmission. A MONETARY TRANSMISSION SCHEMA Monetary transmission is a complex and interesting topic because there is not one, but many, channels through which monetary policy operates. The exhibit depicts schematically an eclectic view of monetary policy transmission, identifying the major channels that have been distinguished in the literature.2 The process begins with the transmission of open market operations to market interest rates, either through the reserves market or through the supply and demand for money more broadly. From there, transmission may proceed through any of several channels. The interest rate channel is the primary mechanism at work in conventional macroeconomic models. The basic idea is straightforward: given some degree of price stickiness, an increase in nominal interest rates, for example, translates into an increase in the real rate of interest and the user cost of capital. These changes in turn lead to a postponement in consumption or a reduction in investment spending. …
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