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- [Alex] In order to work well,
fiscal policy must be timely, targeted, and temporary,
as we discuss in our previous video.
But fiscal policy can also be fully or partially offset
depending on how central banks,
businesses, and consumers respond to fiscal policy.
First: central banks.
When a government increases spending,
the aggregate demand curve shifts out,
which increases inflation.
Now, central banks often try to stabilize prices.
So if fiscal spending shifts the aggregate demand curve out,
increasing inflation,
the central bank might choose to contract the money supply.
Contracting the money supply
means shifting the aggregate demand curve inwards.
In other words, monetary policy could offset
or reverse the fiscal policy expansion.
When a central bank responds to expansionary fiscal policy
with contractionary monetary policy,
we call this a monetary offset.
But it's not just the central banks
that respond to changes in fiscal policy --
businesses could also act in ways
that partially offset a fiscal stimulus.
For example, if the government increases spending by borrowing,
this will tend to increase the interest rate
in the loanable funds market.
And if the interest rate increases,
businesses may scale back on their investment.
So remember that real GDP is consumption plus investment
plus government spending and net exports.
So when "G" increases,
we may see a decrease in "I," investment,
offsetting the fiscal stimulus
and weakening the effects of the multiplier.
Consumers could also respond to fiscal policy
in ways that make fiscal policy less effective.
If the government cuts taxes to stimulate the economy,
people might then choose to save the tax cut.
Now, saving money from a tax cut actually makes a lot of sense
if people expect that tax cuts today
will be matched by tax increases tomorrow.
However, if people save their tax cuts
instead of spending them,
then the aggregate demand curve never shifts out.
The multiplier will be zero,
and there will be no systematic macroeconomic effects.
Now this scenario is sometimes called Ricardian equivalence,
after the 19th-century British economist, David Ricardo.
Most economists think that it's somewhat unrealistic
to model everyone as fully rational
and incorporating their future tax burdens
when making saving and spending decisions.
Tyler claims that he never behaves in this way,
though I'm not so sure that's true.
Some people, however -- they are very future-oriented.
And most people -- they think a little bit about the future
when making spending decisions.
So Ricardian equivalence probably describes some people,
maybe not most people.
In any case, to the extent
that Ricardian equivalence reflects how people plan,
tax cuts will be less effective as fiscal stimulus
than they otherwise would be.
Okay, summing up.
Fiscal policy is complicated, because it's not just a matter
of increasing government spending --
we also have to take into account how central banks, investors,
and consumers respond to fiscal policy.
Moreover, how people respond to fiscal policy isn't mechanical.
It depends upon their evaluation of the economic situation
and their expectations about the future.
So the same fiscal policy can have different effects
in different historical situations.
Good economic policy therefore requires
both an understanding of the models
but also an understanding and an appreciation
of the actual situation.
Thus, economic policy is both science and art.
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