1. Automatic Stabiliser
Government spending and taxation that automatically change to reduce variations in economic activity. For
example, an increase in economic activity will result in individuals and businesses paying more taxes. These
increased tax payments will leave consumers and businesses with less money to spend. Declining economic
activity will be accompanied by increased unemployment benefits.
In macroeconomics automatic stabilisers work as a tool to reducing the fluctuations in real GDP without any plain
policy action by the government. It is a government program that changes automatically depending on GDP and a
person’s income, and acts as a negative feedback loop on GDP.
The size of the government deficit tends to increase as a country enters recession, which helps keep national income
high through the multiplier.
Furthermore, imports often tend to decrease in a recession, meaning more of the national income is spent at home
rather than abroad. This also helps stabilise the economy.
Definition
Policies or institutions (built into an economic system) that automatically tend to dampen economic cycle
fluctuations in income, employment, etc., without direct government intervention. For example, in boom times,
progressive income tax automatically reduces money supply as incomes and spending rise. Similarly, in
recessionary times, payment of unemployment benefits injects more money in the system and stimulates demand.
Also called automatic stabilizers or built-in stabilizers.
Induced taxes
Government tax revenue tends to fall as a proportion of national income during recessions.
This occurs because of the way tax systems are generally constructed.
Income tax is generally at least somewhat progressive. If an individual's income rises, then their average tax rate
increases. This means that as incomes fall, households pay less as a proportion of their income in direct taxation.
Corporation tax is generally based on profits, rather than turnover. In a recession profits tend to fall much faster than
turnover. Therefore, a corporation pays much less tax while having only slightly less economic activity.
If national income rises, by contrast, then both households and corporations end up paying higher proportions of
their income in tax.
This means that in an economic boom tax revenue is higher and in a recession tax revenue lower; not only in
absolute terms but as a proportion of national income.
Other forms of tax do not exhibit these effects, because they are roughly proportionate to income (e.g. taxes on
consumption like sales tax or value added tax, or they bear no relation to income (e.g. poll tax or property tax).
Transfer payments
Most governments also pay unemployment and welfare benefits. Generally speaking, the number of unemployed
people and those on low incomes who are entitled to other benefits increases in a recession and decreases in a boom.
This means that government expenditure increases automatically in recessions and decreases automatically in a
boom in absolute terms. Since the trend of output is to increase in booms and decrease in recessions, expenditure is
expected to increase as a share of income in recessions and decrease as a share of income in booms.

2. When stabilisers don't work
There is broad consensus amongst economists that the automatic stabilisers often exist and function in the short
term.
However, the automatic stabilisers model does not incorporate rational expectations or other microfoundations. No
part of economics is in the final analysis a mechanistic process and the existence of the stabilisers can easily be
overshadowed by other changes to policy, expectations or markets.
Automatic stabilisers incorporated into the expenditure multiplier
This section incorporates automatic stabilisation into a broadly Keynesian multiplier model.
MPC = Marginal propensity to consume
T = Induced taxes
MPI = Marginal Propensity to Import
Holding all other things constant, ceteris paribus, the greater the level of taxes, or the greater the MPI then the value
of this multiplier will drop. For example, let’s assume that:
→ MPC = 0.8
→T=0
→ MPI = 0.2
Here we have an economy with zero marginal taxes and zero transfer payments. If these figures were substituted into
the multiplier formula, the resulting figure would be 2.5. This figure would give us the instance where a (for
instance) $1 billion change in expenditure would lead to a $2.5 billion change in equilibrium real GDP.
Lets now take an economy where there are positive taxes (an increase from 0 to 0.2), while the MPC and MPI
remain the same:
→ MPC = 0.8
→ T = 0.2
→ MPI = 0.2
If these figures were now substituted into the multiplier formula, the resulting figure would be 1.79. This figure
would give us the instance where, again, a $1 billion change in expenditure would now lead to only a $1.79 billion
change in equilibrium real GDP.
This example shows us how the multiplier is lessened by the existence of an automatic stabiliser, and thus helping to
lessen the fluctuations in real GDP as a result from changes in expenditure. Not only does this example work with
changes in T, it would also work by changing the MPI while holding MPC and T constant as well.

3. Conclusion
Higher taxes on capital will hamper the growth of investment and capital stock. The decrease in capital will reduce
economic growth, which will lead to higher unemployment and reduced personal income. Tax rates should not be a
determining factor in allocating investment dollars, and lower tax rates mitigate the lock-in effect.
Investment is a forward-looking enterprise, and companies are already making decisions about their future. Making
permanent the lower tax rates on capital gains and dividends will make future investment more attractive to
businesses and investors. This will ensure more capital stock and economic growth. Congress should therefore make
permanent these reductions on the cost of capital.