The factors that influence aggregate demand and aggregate supply, and how each affects the achievement of the domestic macroeconomic goals, including consumer and business confidence, interest rates, disposable income, the exchange rate, government policy, productivity, costs of production and overseas economic conditions

What this dot point is asking

VCAA wants you to identify the major factors that shift AD and AS, explain the cause-and-effect chain from each factor through to the three macroeconomic goals, and apply the framework to current Australian conditions. Expect short and extended responses requiring AD/AS diagrams.

The answer

The AD/AS framework

Aggregate demand (AD) is the total demand for goods and services in the economy at each price level. AD = C + I + G + (X - M).

Aggregate supply (AS) is the total production of goods and services in the economy at each price level. The short-run aggregate supply curve (SRAS) slopes upward; the long-run aggregate supply curve (LRAS) is vertical at potential output.

A rightward shift of AD raises real GDP and the price level in the short run, raising inflation. A rightward shift of LRAS raises potential output without inflationary pressure.

Factors that affect aggregate demand

1. Consumer confidence

Measured by the Westpac-Melbourne Institute Consumer Sentiment Index. Higher confidence raises consumption (C), shifting AD right.

Recent Australian example

Consumer sentiment fell to recession-era lows during the 2022-23 RBA tightening cycle, weighing on retail spending. It has recovered modestly in 2024-25 as inflation has eased.

2. Business confidence

Measured by the NAB Business Confidence Index. Higher confidence raises investment (I).

3. Interest rates

The cash rate flows through to mortgage, business loan and deposit rates. Higher rates:

• Reduce mortgage holder disposable income (mortgage repayments rise).
• Make borrowing-financed consumption and investment more expensive.
• Raise the return on saving.
• Shift AD left.

The 2022-24 RBA cycle is the textbook current example.

4. Disposable income. After-tax household income. Driven by:

• Wages and salaries (the Wage Price Index).
• Income tax (Stage 3 cuts from 1 July 2024 raised real disposable income by around 1 percent of GDP).
• Transfer payments (Age Pension, JobSeeker).

Higher disposable income raises C, shifting AD right.

5. The exchange rate. AUD movements affect net exports (X - M):

• AUD depreciation raises export competitiveness and makes imports more expensive, supporting AD.
• AUD appreciation has the opposite effect.

The AUD has traded in a USD 0.62 to 0.70 range through much of 2024-25.

6. Government economic activity. Federal, state and local government spending (G). The 2020-21 COVID-19 stimulus was the largest fiscal expansion in Australian peacetime history. The 2024-25 Budget tightened the structural position.

7. Overseas economic conditions. Demand from trading partners. Australia's exports are sensitive to:

• Chinese GDP growth (32 percent of exports).
• Japanese, South Korean and ASEAN demand (combined around 35 percent).
• US monetary conditions affecting global risk appetite.

8. Population growth. Higher population (driven by net overseas migration around 500,000 in 2023-24) raises consumption and housing demand, shifting AD right.

Factors that affect aggregate supply

AS factors operate on the productive capacity of the economy.

1. Productivity. Output per unit of input. Multifactor productivity in Australia has averaged 0.5 percent per year over the last decade, well below the 1.5 percent of the 1990s. Drivers:

• Technology adoption.
• Skills and education.
• Management practices.
• Competition and contestability.

Higher productivity shifts LRAS right, raising potential output without inflation.

2. Costs of production.

• Wages. Wage Price Index growth above productivity growth raises unit labour costs and shifts SRAS left.
• Energy. Wholesale electricity and gas prices spiked in 2022 (Russian invasion of Ukraine), raising production costs across the economy.
• Other inputs. Building materials, transport, financial services.

Lower costs shift AS right; higher costs shift AS left.

3. Tax and regulation. Higher taxes on production and stricter regulation shift AS left. Microeconomic reform (NCP 1995, tariff reductions) shifted Australian AS right.

4. Labour force size and quality.

• Migration. Net overseas migration of 500,000 in 2023-24 (a record) expanded the labour force.
• Participation. Female participation rate has risen from 50 percent in 1980 to 63 percent in 2024.
• Skills. TAFE free places, university funding, apprenticeship support.

A larger and more skilled labour force shifts LRAS right.

5. Capital stock. Investment in machinery, infrastructure, R&D and intellectual property. Mining investment was the swing factor of the 2003-2014 boom. Infrastructure investment (Snowy 2.0, Inland Rail, Western Sydney Airport) is a current driver.

6. Natural resources and environment. Australia's mineral and energy endowment underpins its production capacity. Climate and biodiversity affect long-run capacity (climate-related extreme weather, droughts).

Cause-and-effect chains

The VCE answer style requires explicit cause-and-effect chains. Examples:

Cash rate rise to inflation.

"The RBA raises the cash rate → banks raise mortgage and business loan rates → households reduce consumption and investment falls → AD shifts left → real GDP growth slows and capacity utilisation eases → wage pressure eases and inflation slows."

Productivity growth to growth and inflation.

"A productivity-enhancing reform → output per worker rises → unit costs fall and LRAS shifts right → real GDP rises without raising the price level → low inflation supports continued growth."

AUD depreciation to inflation.

"AUD depreciates → import prices rise in AUD terms → tradables inflation rises → through input costs, services inflation also rises → headline CPI rises."

Application to current Australian conditions (2024-25)

AD pressures:

• Restrictive cash rate (4.35 percent) restraining consumption.
• Slower Chinese growth restraining exports.
• Migration of 500,000 supporting housing demand.
• Stage 3 tax cuts supporting disposable income.
• Fiscal consolidation easing fiscal impulse.

AS pressures:

• Wage growth above productivity (compressing margins).
• Energy market normalisation easing input costs.
• Migration expanding labour force capacity.
• Productivity Commission's 2023 recommendations partially implemented.
• Future Made in Australia targeting long-run capacity.

Net: AD restraint by tight monetary policy is bringing inflation down; AS expansion by migration and reform is gradually raising LRAS.

Limits of the framework

1. Stickiness

Prices and wages adjust with lags, so the textbook AD/AS framework gives the long-run direction but not the short-run path.

2. Multiple shocks

Real economies face simultaneous AD and AS shocks (2022 was both: post-COVID stimulus + Russia-Ukraine supply shock).

3. Distributional effects

AD and AS shifts affect different households differently. Mortgage holders bear the cost of tighter monetary policy; savers benefit.

Common VCE traps

Confusing AD factors with AS factors

Interest rates, confidence and disposable income are AD factors. Productivity, costs and labour force are AS factors.

Drawing AD shifts without identifying which component changed

Specify whether C, I, G or X-M shifted.

Forgetting the LRAS curve

Long-run growth depends on LRAS shifts (productivity, labour force, capital), not just AD movements.