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Lesson M04.L06: Autonomous Spending Changes and Stabilisation Policy

Module: Macroeconomics in the Short-Run: The Basic Keynesian Model Level: intro Duration: 30 minutes Learning Objective: Explain how autonomous spending changes drive fluctuations; evaluate fiscal and monetary stabilisation options; discuss the role of local government spending (Council context). Data as of: 2024 Provenance: OpenStax Macro 3e | RBA Education | ABS Economic Statistics

Explanation

In the Keynesian model, autonomous spending is any component of planned expenditure that does not depend on current income (Y). It includes:

  • Autonomous consumption (a) โ€” spending financed by wealth or borrowing
  • Planned investment (I) โ€” driven by business confidence and interest rates
  • Government spending (G) โ€” set by policy
  • Exports (X) โ€” determined by foreign demand

A change in any autonomous spending component shifts the planned expenditure (PE) line up or down, changing equilibrium output by a multiplied amount (ฮ”Y = k ร— ฮ”A).

How autonomous changes drive fluctuations: - Businesses become pessimistic โ†’ investment falls โ†’ PE shifts down โ†’ output falls (recession) - Export demand collapses (e.g., Chinese slowdown) โ†’ net exports fall โ†’ PE falls โ†’ recession - Consumer confidence crashes (e.g., stock market fall) โ†’ autonomous consumption falls โ†’ recession

Stabilisation policy aims to offset these fluctuations, keeping output close to Y_fe:

Fiscal policy uses government spending (G) and taxation (T) to manage demand: - Expansionary: Increase G or cut T โ†’ raises PE โ†’ closes recessionary gap - Contractionary: Cut G or raise T โ†’ lowers PE โ†’ closes inflationary gap - Limitation: Implementation lags โ€” fiscal decisions require parliament, budget cycles, and project delivery time (especially for infrastructure). By the time spending arrives, the recession may have passed.

Monetary policy uses the RBA cash rate to influence investment and consumption via interest rates: - Expansionary: Cut cash rate โ†’ cheaper borrowing โ†’ I and C rise โ†’ PE rises - Contractionary: Raise cash rate โ†’ costlier borrowing โ†’ I and C fall โ†’ PE falls - Advantage: Faster to implement (monthly RBA board decisions) - Limitation: Less effective when rates are at zero (zero lower bound); business confidence may dominate

Local government (Council) context: Australian local councils control significant autonomous spending โ€” capital works, road maintenance, parks, community infrastructure โ€” often totalling $10โ€“20 billion nationally per year. Councils can act as automatic stabilisers or deliberate counter-cyclical spenders: - During downturns, councils can bring forward planned capital works (e.g., road resurfacing, community centre upgrades) to inject autonomous spending into local economies - This is particularly effective in regional areas where the local council may be the largest single employer or contractor - Example: A regional NSW council brings forward $15 million in road maintenance during a local economic downturn. With a local multiplier of 1.5, total local GDP impact โ‰ˆ $22.5 million โ€” meaningful in a small regional economy

However, councils face borrowing constraints (many must maintain balanced budgets) and may need state or federal grants to fund counter-cyclical spending, limiting their independent stabilisation capacity.

Worked Example

Scenario: A regional Victorian council governs an area with: - Full-employment output: $800 million/year - Current equilibrium output: $720 million (recessionary gap of $80M) - MPC (local spending propensity): 0.70 - Local multiplier: k = 1 รท (1 โˆ’ 0.70) = 3.33

Step 1 โ€” Identify the problem: The local economy has a $80 million recessionary gap. Unemployment is above NAIRU; local businesses are quiet.

Step 2 โ€” Calculate required autonomous spending increase: ฮ”A = Gap รท k = 80 รท 3.33 = $24 million

Step 3 โ€” Council's capital works option: The council has $10 million in deferred road maintenance and $14 million in planned park upgrades. Total = $24 million. It applies to the state government's Regional Infrastructure Fund for co-funding.

Step 4 โ€” Economic impact: ฮ”Y = k ร— ฮ”A = 3.33 ร— \(24M = **\)80 million** โ€” exactly closes the recessionary gap.

Step 5 โ€” Compare to monetary policy: The RBA could cut interest rates to stimulate investment, but: - The region has limited large businesses that respond to interest rate changes - Many residents have fixed-rate mortgages (less sensitive to rate changes) - Council capital works are more targeted and faster to deploy locally โ†’ Fiscal action via council spending is the better stabilisation tool in this regional context

Common Misconception

Misconception: Only the federal government can implement fiscal stabilisation policy โ€” local councils are too small to matter.

Correction: While the federal government dominates macro-level fiscal policy, local governments collectively spend tens of billions annually on capital works. In local economies โ€” particularly regional areas โ€” council spending can be the single largest autonomous demand component. Bringing forward or deferring capital works is a genuine counter-cyclical tool available to councils, and several Australian state governments have explicitly funded councils to do this during downturns (e.g., the Commonwealth's Roads to Recovery programme was expanded during the GFC). Scale matters: what is small nationally can be large locally.

Practice Prompts

  1. Business investment in Australia falls by $30 billion due to falling commodity prices. MPC = 0.80. By how much does equilibrium GDP fall, and what size of government spending increase is needed to offset the fall? โ†’ Answer: k = 1 รท (1โˆ’0.80) = 5. GDP falls by: 5 ร— \(30B = **\)150 billion. To offset, ฮ”G = $30B (same as the fall in I) โ€” because the multiplier applies equally to all autonomous spending components, an equal increase in G exactly offsets the fall in I. Or equivalently: required ฮ”G = \(150B รท 5 = **\)30 billion.

  2. The RBA cuts the cash rate from 4.35% to 3.35%. This stimulates $8 billion of additional private investment. MPC = 0.75. What is the total change in equilibrium output? โ†’ Answer: k = 1 รท (1โˆ’0.75) = 4. ฮ”Y = 4 ร— \(8B = **\)32 billion increase in GDP**.

  3. A local council in regional Queensland is considering whether to bring forward $5 million of stormwater infrastructure during a local downturn. The local MPC is 0.65. Estimate the total local economic impact and explain why this qualifies as stabilisation policy. โ†’ Answer: k = 1 รท (1โˆ’0.65) โ‰ˆ 2.86. ฮ”Y = 2.86 ร— \(5M โ‰ˆ **\)14.3 million** local GDP impact. This is stabilisation policy because the council is deliberately increasing autonomous spending during a downturn to offset falling private demand โ€” consistent with the Keynesian prescription of injecting spending to close a recessionary gap. The spending is counter-cyclical (timed to offset the downturn) rather than purely need-driven.

Further Resources