Ben Bernanke, chairman of the Federal Reserve, discussed in an Aug. 27 speech the policies the Fed has been using to support economic recovery and price stability as well as some of the additional policy options it could consider, especially if the economic outlook were to deteriorate further.
The FOMC has also acted to improve market functioning and to push longer-term interest rates lower through its large-scale purchases of agency debt, agency mortgage-backed securities (MBS), and longer-term Treasury securities, of which the Federal Reserve currently holds more than $2 trillion. The channels through which the Fed's purchases affect longer-term interest rates and financial conditions more generally have been subject to debate. I see the evidence as most favorable to the view that such purchases work primarily through the so-called portfolio balance channel, which holds that once short-term interest rates have reached zero, the Federal Reserve's purchases of longer-term securities affect financial conditions by changing the quantity and mix of financial assets held by the public. Specifically, the Fed's strategy relies on the presumption that different financial assets are not perfect substitutes in investors' portfolios, so that changes in the net supply of an asset available to investors affect its yield and those of broadly similar assets. Thus, our purchases of Treasury, agency debt, and agency MBS likely both reduced the yields on those securities and also pushed investors into holding other assets with similar characteristics, such as credit risk and duration. For example, some investors who sold MBS to the Fed may have replaced them in their portfolios with longer-term, high-quality corporate bonds, depressing the yields on those assets as well.
The logic of the portfolio balance channel implies that the degree of accommodation delivered by the Federal Reserve's securities purchase program is determined primarily by the quantity and mix of securities the central bank holds or is anticipated to hold at a point in time (the "stock view"), rather than by the current pace of new purchases (the "flow view"). In support of the stock view, the cessation of the Federal Reserve's purchases of agency securities at the end of the first quarter of this year seems to have had only negligible effects on longer-term rates and spreads.
The Federal Reserve did not hold the size of its securities portfolio precisely constant after it ended its agency purchase program earlier this year. Instead, consistent with the Committee's goal of ultimately returning the portfolio to one consisting primarily of Treasury securities, we adopted a policy of re-investing maturing Treasuries in similar securities while allowing agency securities to run off as payments of principal were received. To date, we have realized about $140 billion of repayments of principal on our holdings of agency debt and MBS, most of it prior to the end of the purchase program. Continued repayments at this pace, together with the policy of not re-investing the proceeds, were expected to lead to a slight reduction in policy accommodation over time.
However, more recently, as the pace of economic growth has slowed somewhat, longer-term interest rates have fallen and mortgage refinancing activity has picked up. Increased refinancing has in turn led the Fed's holding of agency MBS to run off more quickly than previously anticipated. Although mortgage prepayment rates are difficult to predict, under the assumption that mortgage rates remain near current levels, we estimated that an additional $400 billion or so of MBS and agency debt currently in the Fed's portfolio could be repaid by the end of 2011.
At their most recent meeting, FOMC participants observed that allowing the Federal Reserve's balance sheet to shrink in this way at a time when the outlook had weakened somewhat was inconsistent with the Committee's intention to provide the monetary accommodation necessary to support the recovery. Moreover, a bad dynamic could come into at play: Any further weakening of the economy that resulted in lower longer-term interest rates and a still-faster pace of mortgage refinancing would likely lead in turn to an even more-rapid runoff of MBS from the Fed's balance sheet. Thus, a weakening of the economy might act indirectly to increase the pace of passive policy tightening--a perverse outcome. In response to these concerns, the FOMC agreed to stabilize the quantity of securities held by the Federal Reserve by re-investing payments of principal on agency securities into longer-term Treasury securities. We decided to reinvest in Treasury securities rather than agency securities because the Federal Reserve already owns a very large share of available agency securities, suggesting that reinvestment in Treasury securities might be more effective in reducing longer-term interest rates and improving financial conditions with less chance of adverse effects on market functioning. Also, as I already noted, reinvestment in Treasury securities is more consistent with the Committee's longer-term objective of a portfolio made up principally of Treasury securities. We do not rule out changing the reinvestment strategy if circumstances warrant, however.
By agreeing to keep constant the size of the Federal Reserve's securities portfolio, the Committee avoided an undesirable passive tightening of policy that might otherwise have occurred. The decision also underscored the Committee's intent to maintain accommodative financial conditions as needed to support the recovery. We will continue to monitor economic developments closely and to evaluate whether additional monetary easing would be beneficial. In particular, the Committee is prepared to provide additional monetary accommodation through unconventional measures if it proves necessary, especially if the outlook were to deteriorate significantly. The issue at this stage is not whether we have the tools to help support economic activity and guard against disinflation. We do. As I will discuss next, the issue is instead whether, at any given juncture, the benefits of each tool, in terms of additional stimulus, outweigh the associated costs or risks of using the tool.
Notwithstanding the fact that the policy rate is near its zero lower bound, the Federal Reserve retains a number of tools and strategies for providing additional stimulus. I will focus here on three that have been part of recent staff analyses and discussion at FOMC meetings: (1) conducting additional purchases of longer-term securities, (2) modifying the Committee's communication, and (3) reducing the interest paid on excess reserves. I will also comment on a fourth strategy, proposed by several economists--namely, that the FOMC increase its inflation goals.
A first option for providing additional monetary accommodation, if necessary, is to expand the Federal Reserve's holdings of longer-term securities. As I noted earlier, the evidence suggests that the Fed's earlier program of purchases was effective in bringing down term premiums and lowering the costs of borrowing in a number of private credit markets. I regard the program (which was significantly expanded in March 2009) as having made an important contribution to the economic stabilization and recovery that began in the spring of 2009. Likewise, the FOMC's recent decision to stabilize the Federal Reserve's securities holdings should promote financial conditions supportive of recovery.
I believe that additional purchases of longer-term securities, should the FOMC choose to undertake them, would be effective in further easing financial conditions. However, the expected benefits of additional stimulus from further expanding the Fed's balance sheet would have to be weighed against potential risks and costs. One risk of further balance sheet expansion arises from the fact that, lacking much experience with this option, we do not have very precise knowledge of the quantitative effect of changes in our holdings on financial conditions. In particular, the impact of securities purchases may depend to some extent on the state of financial markets and the economy; for example, such purchases seem likely to have their largest effects during periods of economic and financial stress, when markets are less liquid and term premiums are unusually high. The possibility that securities purchases would be most effective at times when they are most needed can be viewed as a positive feature of this tool. However, uncertainty about the quantitative effect of securities purchases increases the difficulty of calibrating and communicating policy responses.
Another concern associated with additional securities purchases is that substantial further expansions of the balance sheet could reduce public confidence in the Fed's ability to execute a smooth exit from its accommodative policies at the appropriate time. Even if unjustified, such a reduction in confidence might lead to an undesired increase in inflation expectations. (Of course, if inflation expectations were too low, or even negative, an increase in inflation expectations could become a benefit.) To mitigate this concern, the Federal Reserve has expended considerable effort in developing a suite of tools to ensure that the exit from highly accommodative policies can be smoothly accomplished when appropriate, and FOMC participants have spoken publicly about these tools on numerous occasions. Indeed, by providing maximum clarity to the public about the methods by which the FOMC will exit its highly accommodative policy stance--and thereby helping to anchor inflation expectations--the Committee increases its own flexibility to use securities purchases to provide additional accommodation, should conditions warrant.
A second policy option for the FOMC would be to ease financial conditions through its communication, for example, by modifying its post-meeting statement. As I noted, the statement currently reflects the FOMC's anticipation that exceptionally low rates will be warranted "for an extended period," contingent on economic conditions. A step the Committee could consider, if conditions called for it, would be to modify the language in the statement to communicate to investors that it anticipates keeping the target for the federal funds rate low for a longer period than is currently priced in markets. Such a change would presumably lower longer-term rates by an amount related to the revision in policy expectations.
Central banks around the world have used a variety of methods to provide future guidance on rates. For example, in April 2009, the Bank of Canada committed to maintain a low policy rate until a specific time, namely, the end of the second quarter of 2010, conditional on the inflation outlook.4 Although this approach seemed to work well in Canada, committing to keep the policy rate fixed for a specific period carries the risk that market participants may not fully appreciate that any such commitment must ultimately be conditional on how the economy evolves (as the Bank of Canada was careful to state). An alternative communication strategy is for the central bank to explicitly tie its future actions to specific developments in the economy. For example, in March 2001, the Bank of Japan committed to maintaining its policy rate at zero until Japanese consumer prices stabilized or exhibited a year-on-year increase. A potential drawback of using the FOMC's post-meeting statement to influence market expectations is that, at least without a more comprehensive framework in place, it may be difficult to convey the Committee's policy intentions with sufficient precision and conditionality. The Committee will continue to actively review its communication strategy, with the goal of communicating its outlook and policy intentions as clearly as possible.
