62 PART 3: SUMMARY OF ECONOMIC PROJECTIONS
in the bottom-left panels of those gures. Participants
also provide judgments as to whether the risks to their
projections are weighted to the upside, are weighted to
the downside, or are broadly balanced. That is, while the
symmetric historical fan charts shown in the top panels of
gures4.A through 4.C imply that the risks to participants’
projections are balanced, participants may judge that
there is a greater risk that a given variable will be above
rather than below their projections. These judgments
are summarized in the lower-right panels of gures 4.A
through 4.C.
As with real activity and ination, the outlook for
the future path of the federal funds rate is subject to
considerable uncertainty. This uncertainty arises primarily
stance of monetary policy depends importantly on
the evolution of real activity and ination over time. If
economic conditions evolve in an unexpected manner,
then assessments of the appropriate setting of the federal
funds rate would change from that point forward. The
nal line in table2 shows the error ranges for forecasts of
short-term interest rates. They suggest that the historical
condence intervals associated with projections of the
federal funds rate are quite wide. It should be noted,
however, that these condence intervals are not strictly
consistent with the projections for the federal funds
rate, as these projections are not forecasts of the most
likely quarterly outcomes but rather are projections
of participants’ individual assessments of appropriate
monetary policy and are on an end-of-year basis.
However, the forecast errors should provide a sense of the
uncertainty around the future path of the federal funds rate
generated by the uncertainty about the macroeconomic
variables as well as additional adjustments to monetary
policy that would be appropriate to offset the effects of
shocks to the economy.
If at some point in the future the condence interval
around the federal funds rate were to extend below zero,
it would be truncated at zero for purposes of the fan chart
shown in gure5; zero is the bottom of the lowest target
range for the federal funds rate that has been adopted
construction of the federal funds rate fan chart would be
merely a convention; it would not have any implications
for possible future policy decisions regarding the use of
negative interest rates to provide additional monetary
policy accommodation if doing so were appropriate. In
such situations, the Committee could also employ other
tools, including forward guidance and asset purchases, to
provide additional accommodation.
While gures 4.A through 4.C provide information on
the uncertainty around the economic projections, gure1
provides information on the range of views across FOMC
participants. A comparison of gure1 with gures4.A
through 4.C shows that the dispersion of the projections
across participants is much smaller than the average
forecast errors over the past 20years.
The economic projections provided by the members of
the Board of Governors and the presidents of the Federal
Reserve Banks inform discussions of monetary policy
among policymakers and can aid public understanding
of the basis for policy actions. Considerable uncertainty
attends these projections, however. The economic and
statistical models and relationships used to help produce
economic forecasts are necessarily imperfect descriptions
of the real world, and the future path of the economy
can be affected by myriad unforeseen developments and
events. Thus, in setting the stance of monetary policy,
participants consider not only what appears to be the
most likely economic outcome as embodied in their
projections, but also the range of alternative possibilities,
the likelihood of their occurring, and the potential costs to
the economy should they occur.
Table 2 summarizes the average historical accuracy
of a range of forecasts, including those reported in past
Monetary Policy Reports and those prepared by the
Federal Reserve Board’s staff in advance of meetings of the
Federal Open Market Committee (FOMC). The projection
error ranges shown in the table illustrate the considerable
uncertainty associated with economic forecasts. For
example, suppose a participant projects that real gross
domestic product (GDP) and total consumer prices will
rise steadily at annual rates of, respectively, 3percent and
2percent. If the uncertainty attending those projections
is similar to that experienced
in the past and the risks
around the projections are broadly balanced, the numbers
reported in table2 would imply a probability of about
70percent that actual GDP would expand within a range
of 1.7 to 4.3percent in the current year, 1.0 to 5.0percent
in the second year, and 0.9 to 5.1percent in the third
year. The corresponding 70percent condence intervals
for overall ination would be 1.3 to 2.7percent in the
current year and 1.0 to 3.0percent in the second and third
years. Figures 4.A through 4.C illustrate these condence
bounds in “fan charts” that are symmetric and centered on
the medians of FOMC participants’ projections for GDP
growth, the unemployment rate, and ination. However,
in some instances, the risks around the projections may
not be symmetric. In particular, the unemployment rate
cannot be negative; furthermore, the risks around a
particular projection might be tilted to either the upside or
the downside, in which case the corresponding fan chart
would be asymmetrically positioned around the median
projection.
Because current conditions may differ from those that
prevailed, on average, over history, participants provide
judgments as to whether the uncertainty attached to
their projections of each economic variable is greater
than, smaller than, or broadly similar to typical levels
presented in table2 and reected in the widths of the
condence intervals shown in the top panels of gures
4.A through 4.C. Participants’ current assessments of the
uncertainty surrounding their projections are summarized
Forecast Uncertainty