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Coping With Age

March 13th, 2013

by Zach Pandl

of Columbia Management

Many things in life get better with age (wine, cheese, blue jeans), but many others do not (athletic ability, sushi, hangovers). Unfortunately for central banks, the effects of unconventional monetary policy probably fall in the latter category. Unlike traditional monetary policy—in which the central bank only sets short-term interest rates—the impact of unconventional policies likely decays over time. This means that it is not enough for the Federal Reserve to keep its current policies in place—it actually has to take additional action to maintain the same impact on interest rates and the economy.

There are two main reasons for this.

First, as time passes, the point at which the Fed will start raising the funds rate gets closer and closer. All else being equal this will cause longer-term interest rates to drift higher, because longer-term rates imbed expectations about the future path for short-term rates. Chairman Bernanke actually made this point explicitly in his recent speech on bond yields: “long-term rates would be expected to rise gradually … this rise would occur as the market’s view of the expected date at which the Federal Reserve will begin the removal of policy accommodation draws nearer.”

Second, without ongoing policy efforts, the average duration of the Fed’s securities portfolio is always in decline. The theory and evidence on quantitative easing (QE) suggests that the policy works primarily by removing duration risk from private sector hands which in turn reduces interest rates. In effect, the aging of the Fed’s balance sheet slowly adds back this duration risk to the market, putting upward pressure on rates. These changes are quantitatively meaningful. For example, the Fed’s securities portfolio is expected to reach about $3.75 trillion by the end of this year. At that level, a one year decline in the portfolio’s average duration would reduce the Fed’s total duration risk by about $415 billion 10-year equivalents (10-year equivalents measure the amount of current 10-year Treasuries that would total to the same level of overall duration risk). Empirical work suggests that reducing the duration of the Fed’s balance sheet by this amount would push up long-term interest by 15-20 basis points (bps).

Using market data we can roughly estimate the total time decay effect. As shown in the chart, in recent years there has been a very tight relationship between the level of 10-year yields and the length of time markets expect the funds rate to remain at zero (we estimate the latter from fed funds futures contracts). Longer-term rates decline when the first rate hike appears further away, and longer-term rates rise when the first rate hike appears closer. The estimated slope of this relationship is -0.05—meaning that as long as the calendar date of the first rate hike remains unchanged, 10-year Treasury yields should creep higher by about 5 bps per month.

An obvious question would be: if the impact of the unconventional easing decays over time, why have Treasury yields mostly declined since 2009? The reason is that the Fed never really stopped easing. After QE1 came QE2, two phases of operation twist, and now open-ended QE. The Fed’s verbal easing also turned more aggressive (“some time,” “extended period,” “mid-2013,” “late 2014,” “mid-2015”). We will only observe the aging effect of unconventional policies when the easing process finally ends.

The market implications of the time decay effect are somewhat nuanced. On the one hand, the impact on rates means that the carry returns to Treasuries look even less attractive. In fact, the estimated decay effect of 5 bps per month is greater than the monthly carry return for a 10-year Treasury (roughly 3 bps per month per unit of duration). On the other hand, the decay effect increases the odds of more monetary easing in the future. New easing steps by the Fed look unlikely at the moment, but the decay effect could conceivably be used as a justification for more action at some point.

Disclosure

The views expressed are as of 3/11/13, may change as market or other conditions change, and may differ from views expressed by other Columbia Management Investment Advisers, LLC (CMIA) associates or affiliates. Actual investments or investment decisions made by CMIA and its affiliates, whether for its own account or on behalf of clients, will not necessarily reflect the views expressed. This information is not intended to provide investment advice and does not account for individual investor circumstances. Investment decisions should always be made based on an investor's specific financial needs, objectives, goals, time horizon, and risk tolerance. Asset classes described may not be suitable for all investors. Past performance does not guarantee future results and no forecast should be considered a guarantee either. Since economic and market conditions change frequently, there can be no assurance that the trends described here will continue or that the forecasts are accurate.

This material may contain certain statements that may be deemed forward-looking. Please note that any such statements are not guarantees of any future performance and actual results or developments may differ materially from those discussed. There is no guarantee that investment objectives will be achieved or that any particular investment will be profitable.

Investment products are not federally or FDIC-insured, are not deposits or obligations of, or guaranteed by any financial institution, and involve investment risks including possible loss of principal and fluctuation in value.

Securities products offered through Columbia Management Investment Distributors, Inc., member FINRA. Advisory services provided by Columbia Management Investment Advisers, LLC.

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