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1 How Changes in Economic Conditions Might Affect the Federal Budget 1 (June 2018)

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                       ~JUNE 2018






How Changes in Economic Conditions Might

                   Affect the Federal Budget


One source of uncertainty in budget projections stems
from the fact that the federal budget is highly sensitive
to economic conditions, which are difficult to predict.
If conditions differed from those in the Congressional
Budget Office's economic forecast, budgetary outcomes
could diverge from those in the agency's baseline budget
projections.1

To show how changes in economic conditions might
affect the budget, CBO has analyzed what might happen
to the budget if the following key economic variables
differed from those in the agency's current economic
forecast:

  The growth of productivity and, consequently, the
   growth of real (inflation-adjusted) gross domestic
   product (GDP);

  Labor force growth and, in turn, real economic
   growth;

  Interest rates; and

  Inflation.


1. For this analysis, CBO used the economic forecast presented in
   Congressional Budget Office, The Budget and Economic Outlook:
   2018 to 2028 (April 2018), www.cbo.gov/publication/53651,
   and the baseline budget projections published in Congressional
   Budget Office, An Analysis of the President' 2019 Budget
   (May 2018), www.cbo.gov/publication/53884.


CBO created and analyzed four illustrative scenarios to
develop rules of thumb for those variables. The sce-
narios are for the following changes from the agency's
current economic forecast, all of which would increase
deficits above the amounts in CBO's baseline budget
projections: slower growth of productivity (in this analy-
sis, total factor productivity, which is real output per unit
of combined labor and capital services), slower growth of
the labor force, higher interest rates, and higher infla-
tion. Those scenarios were chosen for simplicity, but
the variables could be higher or lower than they are in
CBO's forecast. The rules of thumb are symmetrical, so
if productivity or the labor force increased more quickly
than projected, or if interest rates or inflation were lower
than projected, deficits would be smaller than they are in
the agency's baseline budget projections.

The rules of thumb can be used to analyze other
economic scenarios that differ from CBO's forecast,
although there are a few caveats that must be kept in
mind. Among the most important is that each rule shows
the effects of differences in a single key variable, but any
factor that caused a change in one such variable would
probably have additional direct effects on the economy
(and thus on the budget). Those broader effects are not
incorporated into the rules of thumb.

Background
Economic conditions affect federal revenues and outlays
in several ways. Revenues depend on the total amount
of income that is subject to taxation-including total


Note: Unless otherwise indicated, all years referred to in describing budget projections are federal fiscal years, which run from
October 1 to September 30 and are designated by the calendar year in which they end. Years referred to in describing economic
projections are calendar years. Numbers in the text and tables may not add up to totals because of rounding.

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