Using a static AD-AS model, show and explain how the situation described by the RBA Governor led to high inflation in Australia.

The situation described by the RBA Governor highlights two main factors contributing to high inflation in Australia: global supply shocks and strong domestic demand. We can illustrate this using a static AD-AS model.

Aggregate Demand (AD) represents the total demand for goods and services in the economy. When there’s an increase in demand, it puts upward pressure on prices.

Aggregate Supply (AS) represents the total quantity of goods and services that an economy can produce and supply. When supply is disrupted, it can lead to higher prices due to scarcity.

Here’s a step-by-step explanation

Step 1: Draw the AD-AS model with two intersecting curves, one representing AD and the other representing AS. Label them accordingly.

Step 2: On the AD curve, shift it to the right to indicate an increase in demand due to factors like strong domestic demand, which could result from increased consumer spending or government expenditure. This shift puts upward pressure on both output and price levels.

Step 3: On the AS curve, shift it to the left to indicate a decrease in supply due to global supply shocks. These shocks, such as disruptions in supply chains and increased commodity prices due to geopolitical events, reduce the economy’s capacity to produce goods and services. This shift results in higher prices but lower output.

Step 4: The intersection of the new AD and AS curves represents the new equilibrium. In this scenario, you’ll observe a higher price level (inflation) and potentially a lower level of output, indicating a period of stagflation where both inflation and unemployment may be elevated.

Step 5: Explain the diagram, emphasizing that the global supply shocks have reduced the economy’s productive capacity, leading to cost-push inflation. Meanwhile, strong domestic demand exacerbates the inflationary pressures by increasing overall demand for goods and services.

Using the static AD-AS model, show and explain how the decision to increase interest rates would have achieved the goal of controlling inflation for the RBA.

To control inflation, central banks like the Reserve Bank of Australia (RBA) often use monetary policy tools, such as adjusting interest rates.

Step 1: Begin with the same AD-AS diagram you created in Part A.

Step 2: Show the initial equilibrium where AD intersects AS, resulting in high inflation and potentially reduced output.

Step 3: Now, introduce the RBA’s decision to increase the official cash rate. This is represented by shifting the AD curve to the left. Increasing interest rates makes borrowing more expensive, reducing consumer spending and investment.

Step 4: The new intersection of AD and AS represents a lower overall level of demand and potentially lower output. As a result, you’ll observe a lower price level (inflation) and a potential return to full employment.

Step 5: Explain the diagram, emphasizing that by increasing interest rates, the RBA has effectively reduced aggregate demand, which counteracts the inflationary pressures caused by strong domestic demand. This policy action helps bring inflation under control.

In summary, the static AD-AS model illustrates how a combination of global supply shocks and strong domestic demand can lead to high inflation. It also demonstrates how the RBA’s decision to increase interest rates can be an effective tool in controlling inflation by reducing aggregate demand.