Government purchases affect spending directly; tax changes work through private decisions.
Discretionary fiscal policy is a deliberate change in government spending or taxation. Additional purchases of domestic goods and services directly support demand; lower income taxes may raise disposable income and consumption. Expansionary measures can raise output and employment when resources are underused. Contractionary measures reduce demand pressure. The final effect depends on private responses, domestic content, capacity and timing, not just the announced budget amount.
- Fiscal policy
- Fiscal policy uses government spending and taxes to influence the economy. A discretionary measure is a deliberate change, such as bringing forward a repair programme or cutting an income-tax rate.
- Purchases and income
- G means government purchases of current output; C means household consumption. An income-tax cut raises disposable income: income after direct taxes, plus cash transfers. Households decide how much extra income to spend.
- Timing and location
- Announcing a project does not immediately buy output. Purchases of domestic services support domestic production; imported equipment is produced abroad, though it may improve local capacity later.
Spending decisions and their effects
Expansion and contraction
More purchases or lower taxes can support demand; fewer purchases or higher taxes can restrain it. The composition and private response determine the net effect.
Discretionary versus automatic
Discretionary action is a deliberate policy change. Falling tax receipts during a downturn can occur under unchanged tax rules; a bigger deficit alone does not prove a new discretionary stimulus.
Investment timing
A public infrastructure project purchases output during construction and may improve capacity once operational. Separate these demand and supply channels.
Worked example: Repairs and an income-tax cut
An economy has weak private spending and unemployed construction workers. The government brings forward repairs using domestic services. It also cuts household income tax.
- The repair purchases directly increase G and demand for domestic production.
- The tax cut raises disposable income, but households may spend, save or repay debt.
- The firms doing repairs pay workers and suppliers, who may spend part of that income on more domestic output. These further rounds can support production, but limited capacity may also lead to higher prices.
Watch out for this
A tax cut of $1 creates exactly the same immediate domestic demand as a $1 purchase.
A tax cut first changes private resources. Its spending effect depends on how much is spent and whether it buys domestic output.
Check your understanding
A government purchases extra domestic maintenance services. What is the immediate AD channel?
- A compulsory rise in every household's saving.
- Higher G, with possible later income and consumption rounds.
- A movement along unchanged AD caused only by a lower price level.