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How CBO Analyzes the Effects of Changes in Federal Fiscal Policies on the Economy 1 (November 2014)

handle is hein.congrec/cbo1982 and id is 1 raw text is: .   _4.--NOV EMBER 2014
How CBO Analyzes the
Effects of Changes in Federal
Fiscal Policies on the Economy

Summary
Analyzing the effects on the overall economy of changes
in federal fiscal policies-that is, policies governing taxes
and spending-requires complex modeling and a signifi-
cant amount of time. The Congressional Budget Office
(CBO) undertakes such analyses in certain reports and
for some major pieces of legislation; some of those analy-
ses include the feedback effects of changes in the econ-
omy on the federal budget.1 CBO estimates the economic
effects of changes in fiscal policies in both the short term
and the longer term. The agency conducts its analyses
using evidence about the effects of similar policies that
have been implemented previously and using results from
a variety of economic models.
In the short term, changes in fiscal policies affect the
overall economy primarily by influencing the demand
for goods and services by consumers, businesses, and
governments, which leads to changes in output relative to
potential (maximum sustainable) output. For example,
1. CBO's estimates of the budgetary effects of proposed legislation
generally do not reflect changes in behavior that would affect total
output in the economy, such as any changes in the labor supply
or private investment resulting from changes in fiscal policy.
That is, CBO's cost estimates generally do not include what is
sometimes known as dynamic scoring. The convention of not
incorporating macroeconomic effects in cost estimates, a practice
that has been followed in the Congressional budget process since
it was established in 1974, primarily reflects several facts: Doing
macroeconomic analysis of all proposed legislation would not be
feasible; nearly all proposed legislation analyzed by CBO would
have negligible macroeconomic effects (and thus negligible
feedback to the federal budget); and estimates of macroeconomic
effects are highly uncertain.

decreases in taxes and increases in government spending
generally boost demand, which encourages businesses to
gear up production and hire more workers than they
otherwise would; tax increases and spending cuts gener-
ally reduce demand, which has the opposite effects. In
addition, changes in the supply of labor (the number of
hours of labor that workers would like to provide) can
affect output in the short term if the labor market is
sufficiently tight-that is, if the demand for workers is
high relative to the supply.
In the longer term, changes in fiscal policies primarily
affect output by altering people's incentives to work and
save as well as businesses' incentive to invest, thereby
changing potential output. For example, policy changes
that reduce marginal tax rates-the percentage of an
additional dollar of earnings that is unavailable to a tax-
payer because it is paid in taxes-generally encourage
more work and saving. As another example, policy
changes that reduce the federal deficit typically lead to
more national saving (the total amount of saving by
households, businesses, and governments) and invest-
ment, ultimately boosting output and income. Changes
to fiscal policies may also affect potential output by alter-
ing the amount of government investment (for example,
spending or tax subsidies for infrastructure, education
and training, or research and development).
How Does CBO Estimate the Short-Term Effects of
Changes in Fiscal Policies on the Overall Economy?
CBO assesses the short-term effects of changes in fiscal
policies on the overall economy by estimating the impact
of those policies on the demand for goods and services
and combining those results with estimates of the

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