IB DP Economics - Unit 3 - Supply-side effects of fiscal policies-Study Notes - New Syllabus

Supply-Side Effects of Fiscal Policies

Although fiscal policy is mainly used as a demand-side policy to influence aggregate demand (AD), it can also create important supply-side effects by affecting the economy’s productive capacity and long-run aggregate supply (LRAS).

Fiscal policy → Better productivity and capacity → Increase in LRAS

Explanation:

• Government spending and taxation policies can influence:
  • Productivity
  • Efficiency
  • Labour supply
  • Investment
• These changes affect the economy’s ability to produce goods and services in the long run.

1. Government Spending on Education and Training

• Fiscal policy can increase spending on education and skills training.
• This improves human capital and labour productivity.
• Workers become more skilled and adaptable.

Better education → Higher productivity → Higher LRAS

Economic Significance:

• Reduces structural unemployment.
• Improves long-term economic growth.
• Increases international competitiveness.

2. Government Spending on Infrastructure

• Fiscal policy may finance infrastructure projects such as:
  • Roads
  • Ports
  • Electricity systems
  • Communication networks
• Efficient infrastructure lowers business costs and improves productivity.

Better infrastructure → Lower costs → Greater productive capacity

Economic Significance:

• Encourages investment.
• Improves efficiency and mobility.
• Supports long-term growth.

3. Government Spending on Healthcare

• Healthcare spending improves the quality of the labour force.
• Healthy workers are more productive and absent less often.
• Increases labour force participation.

Better healthcare → Healthier workforce → Higher productivity

4. Tax Policies Affecting Incentives

• Lower personal income taxes may encourage greater work effort.
• Lower business taxes may increase investment and innovation.
• Tax incentives can stimulate entrepreneurship and R&D.

Lower taxes → Greater incentives → More investment and productivity

5. Fiscal Policy and Long-Run Aggregate Supply (LRAS)

• When fiscal policy improves productivity and productive capacity, LRAS shifts to the right.
• This increases potential output without necessarily causing inflation.

Improved productive capacity → Rightward shift of LRAS

Economic Significance:

• Promotes sustainable economic growth.
• Improves living standards.
• Helps reduce inflationary pressure through greater productive capacity.

Evaluation:

• Supply-side effects often take a long time to occur.
• Government spending may increase public debt.
• Poorly targeted spending may waste resources.
• Tax cuts may reduce government revenue.

Economic Logic:

• Fiscal policy affects not only AD but also LRAS.
• Investment in human and physical capital improves productivity.
• Supply-side effects are mainly long term.