Aggregate Demand and Aggregate Supply: Equilibrium Output and Price Level Questions

Question 1

Define aggregate demand (AD).

Accepted Answer

Aggregate demand is the total demand for final goods and services in an economy at different price levels.

Question 2

Define aggregate supply (AS).

Accepted Answer

Aggregate supply is the total output of final goods and services produced in an economy at different price levels during a period.

Question 3

Write the components of AD.

Accepted Answer

AD = C + I + G + (X − M).

Question 4

What is macroeconomic equilibrium?

Accepted Answer

Macroeconomic equilibrium is the situation where aggregate demand equals aggregate supply, determining equilibrium output and price level.

Question 5

What is demand-pull inflation?

Accepted Answer

Demand-pull inflation is a rise in the general price level due to an increase in aggregate demand.

Question 6

What is cost-push inflation?

Accepted Answer

Cost-push inflation is a rise in the general price level caused by an increase in costs that shifts aggregate supply left.

Question 7

Write any three factors that shift aggregate demand (AD).

Accepted Answer

Factors that shift AD include:

1) Change in consumption due to income/confidence or taxes.
2) Change in investment due to interest rate or expectations.
3) Change in government spending or net exports (X − M).

(Any three factors can be written.)

Question 8

Write any three factors that shift aggregate supply (AS).

Accepted Answer

Factors that shift AS include:

1) Technology/productivity changes.
2) Changes in input costs (wages, raw materials, oil).
3) Supply disruptions or changes in infrastructure/efficiency.

(Any three factors can be written.)

Question 9

Differentiate between demand-pull and cost-push inflation (any three points).

Accepted Answer

Demand-pull and cost-push inflation differ as follows:

| Point | Demand-pull | Cost-push |
|---|---|---|
| Main cause | AD shifts right | AS shifts left |
| Output effect | output often rises | output often falls |
| Example | higher G/credit boom | oil price shock, wage rise |

(Any three points can be written.)

Question 10

Explain movement along AD curve vs shift in AD (any three points).

Accepted Answer

Difference:

1) Movement along AD occurs due to change in general price level.
2) Shift in AD occurs due to changes in C, I, G, X−M (not price level).
3) A shift changes the whole demand schedule at each price level; movement changes quantity demanded at a given curve.

(Any three points can be written.)

Question 11

State any three components of aggregate demand and explain briefly.

Accepted Answer

Components of AD include:

1) Consumption (C): household spending.
2) Investment (I): spending on capital goods/inventories.
3) Government expenditure (G): government final spending.

(Any three including net exports can be written.)

Question 12

Write any three uses of AD–AS model.

Accepted Answer

Uses of AD–AS model include:

1) Explaining determination of output and price level.
2) Explaining inflation types (demand-pull and cost-push).
3) Analyzing effects of fiscal/monetary policy and supply shocks.

(Any three uses can be written.)

Question 13

Explain aggregate demand and aggregate supply and show macro equilibrium with a table.

Accepted Answer

Aggregate demand (AD) is the total planned spending on final goods and services in an economy at different price levels. It is made up of consumption, investment, government spending and net exports. In symbols: AD = C + I + G + (X − M).

Aggregate supply (AS) is the total output of goods and services that firms are willing to produce at different price levels. In the short run, AS is often upward sloping because higher prices can encourage higher production when some costs are fixed.

Macroeconomic equilibrium occurs at the intersection of AD and AS. At this point, planned spending equals planned output, so firms have no reason to change production and the general price level tends to be stable.

| Concept | Meaning | Key points |
|---|---|---|
| AD | total planned spending | depends on C, I, G, X−M |
| AS | total output supplied | depends on costs, technology, productivity |
| Equilibrium | AD = AS | determines P* and Y* |

Thus, the AD–AS model helps explain how the economy’s output and price level are determined together.

Question 14

Explain the effect of an increase in aggregate demand on equilibrium output and price level. Use a flowchart.

Accepted Answer

When aggregate demand increases, the AD curve shifts to the right. This may happen due to higher consumption (confidence, lower taxes), higher investment (lower interest rate), higher government spending, or higher net exports.

In the AD–AS framework, a rightward shift in AD creates excess demand at the original equilibrium. Firms respond by increasing production and raising prices, leading to a new equilibrium with higher output and higher price level (given an upward sloping short-run AS).

```mermaid
flowchart LR
  A[Increase in C/I/G/(X−M)] --> B[AD shifts right]
  B --> C[Excess demand at old equilibrium]
  C --> D[Firms raise output]
  D --> E[Price level rises]
  E --> F[New equilibrium: higher Y and higher P]
```

Therefore, demand expansion policies can raise output and employment in the short run, but they may also create inflationary pressure if the economy is near capacity.

Question 15

Differentiate demand-pull and cost-push inflation using AD–AS analysis with a comparison table.

Accepted Answer

Inflation means a sustained rise in the general price level. In the AD–AS model, inflation can arise either from increases in aggregate demand (demand-pull) or from decreases in aggregate supply due to higher costs (cost-push).

| Point | Demand-pull inflation | Cost-push inflation |
|---|---|---|
| AD–AS cause | AD shifts right | AS shifts left |
| Main reason | higher spending (C/I/G/X) | higher costs (oil, wages), supply shock |
| Output effect | output often increases | output decreases (stagflation risk) |
| Policy challenge | control demand without harming growth | reduce costs/improve supply without deep recession |

In demand-pull inflation, higher AD pushes prices up and usually increases output in the short run. In cost-push inflation, rising costs reduce AS, so prices rise while output falls.

Thus, the AD–AS model clearly explains why not all inflation is caused by “too much demand”; inflation can also occur due to supply-side cost shocks.

Aggregate Demand and Aggregate Supply: Equilibrium Output and Price Level

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