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Complete 2008 Annual Report - Federal Reserve Bank of Philadelphia

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Principles <strong>of</strong> Sound Central <strong>Bank</strong>ing<br />

ity to achieve its maximum potential growth rate,<br />

monetary policy plays no role in determining what<br />

that growth rate is. In the long run, the economy’s<br />

growth rate largely reflects two factors. The first<br />

is the growth rate <strong>of</strong> the labor force, which is determined<br />

by demographic factors such as the birth<br />

rate, age distribution, and immigration. The second<br />

is the growth in the productivity <strong>of</strong> the labor<br />

force, which depends on a number <strong>of</strong> elements,<br />

including both physical and human capital. Monetary<br />

policy cannot be used to achieve a long-run<br />

growth rate that is inconsistent with these economic<br />

fundamentals.<br />

The corollary to this emphasis on price stability is<br />

that monetary policymakers should not commit to<br />

what they cannot deliver. It is not possible for a<br />

central bank to achieve a specific rate <strong>of</strong> real economic<br />

growth or unemployment.<br />

And<br />

it is not desirable to<br />

lead the public to<br />

believe it is within<br />

the central bank’s<br />

power to do so.<br />

This does not mean<br />

monetary policy<br />

should ignore changes in broad economic conditions.<br />

The best strategy is to set policy consistent<br />

with controlling inflation over the intermediate<br />

term. By keeping inflation stable when shocks occur,<br />

monetary policy can foster the conditions that<br />

enable households and businesses to make the<br />

necessary adjustments to return the economy to its<br />

long-term growth path. Depending on the nature<br />

<strong>of</strong> the shock, though, this new growth path may be<br />

lower, higher, or the same as its previous growth<br />

path. However, monetary policy itself does not<br />

determine this sustainable path.<br />

Consequently, monetary policy should be managed<br />

in a way that yields the best economic outcome<br />

given the environment at the time. As long<br />

as inflation and expectations about inflation are<br />

well anchored at a level consistent with price stability,<br />

the target federal funds rate should fall with<br />

market rates when the economy weakens and<br />

increase as market rates rise when the economy<br />

strengthens. Yet, this systematic approach should<br />

not be confused with a desire for active management<br />

<strong>of</strong> the real economy.<br />

Unfortunately, what the public has come to expect<br />

<strong>of</strong> monetary policy, and central banking more<br />

generally, has risen considerably over the years.<br />

Indeed, there seems to be a view that monetary<br />

policy is the solution to most, if not all, economic<br />

ills. Not only is this not true, it is a dangerous misconception<br />

and runs the risk <strong>of</strong> setting up expectations<br />

that monetary policy can achieve objectives<br />

it cannot attain. To ensure the credibility <strong>of</strong> monetary<br />

policy, we should never ask monetary policy<br />

To ensure the credibility <strong>of</strong> monetary policy, we<br />

should never ask monetary policy to do more than<br />

it can do. Monetary policy’s objectives should be<br />

not only clear but also realistic and feasible.<br />

to do more than it can do. Monetary policy’s objectives<br />

should be not only clear but also realistic<br />

and feasible.<br />

Thus, in order to clarify the central bank’s mission,<br />

many countries have passed legislation that spells<br />

out specific objectives, <strong>of</strong>ten clearly assigning the<br />

central bank the task <strong>of</strong> maintaining a stable price<br />

level or a low level <strong>of</strong> inflation. Some governments<br />

have defined what level <strong>of</strong> inflation the<br />

central bank should target. In other countries, the<br />

central bank itself has adopted an inflation target.<br />

In so doing, these countries have helped to recognize<br />

what a central bank can and cannot do. I<br />

am in favor <strong>of</strong> the Fed setting an inflation target for<br />

this reason, as I’ll discuss in the next section.<br />

8 <strong>2008</strong> <strong>Annual</strong> <strong>Report</strong> www.philadelphiafed.org

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