CA Final – Economics & Finance
Macro‑Economics – Study Notes (Markdown)
Aim
Provide a concise, self‑contained resource for the “Macro Economics” unit of the CA Final syllabus.
Topics are presented in a logical sequence, followed by an illustrative example and a quick‑revision checklist.
1. Introduction
| Term | Simple Explanation |
|---|---|
| Macroeconomics | The branch of economics that studies aggregate behaviour – total output, income, prices, employment, and the overall performance of the economy. |
| Microeconomics | Focuses on individual agents (households, firms, markets). |
| Policy Tools | Government (fiscal) and central bank (monetary) actions used to influence macro variables. |
2. National Income Accounting
| Item | Definition | Formula |
|---|---|---|
| GDP (Gross Domestic Product) | Total value of final goods/services produced in a country in a given period. | GDP = C + I + G + (X–M) |
| C | Consumption expenditure (households). | |
| I | Gross private investment. | |
| G | Government spending. | |
| X–M | Net exports (exports minus imports). | |
| GNP (Gross National Product) | GDP + income earned by nationals abroad – income earned by foreigners in the domestic economy. | |
| Net National Income (NNI) | GNP – depreciation (capital consumption allowance). | |
| Disposable Income | NNI – taxes + transfer payments. |
Key Identity
GDP = C + I + G + (X–M) – the expenditure approach.
GDP = C + I + G + S – T – equivalence with savings (S) and taxes (T).
3. Macro Growth & Development
| Concept | Key Points |
|---|---|
| Economic Growth | Increase in potential output (Y*) over time; measured by real GDP growth rate. |
| Cohort‑wise Growth Drivers | 1) Capital Accumulation (K) 2) Labor Force Growth (L) 3) Productivity Growth (A). |
| Solow Model | ( Y = A K^\alpha L^{1-\alpha} ). Steady‑state: ( \frac{K}{L} = \left(\frac{s}{n+g+\delta}\right)^{\frac{1}{1-\alpha}} ). |
| Human Capital | Education, health, skill‑enhancement → higher (A). |
| Development Path | Differentiated into growth (quantity) and structural (quality) aspects. |
4. Aggregate Demand & Supply
4.1 Aggregate Demand (AD)
| Component | Effect on AD |
|---|---|
| C | ↑ C → AD shifts right. |
| I | ↑ I → AD shifts right. |
| G | ↑ G → AD shifts right. |
| X–M | ↑ X or ↓ M → AD shifts right. |
| Interest Rate | Lower rates → ↑ investment → AD ↑. |
AD Equation
( Y = C(Y–T) + I(r) + G + X(e) – M(e) )
4.2 Aggregate Supply (AS)
| Short‑Run AS (SRAS) | Long‑Run AS (LRAS) |
|---|---|
| Horizontal at full‑employment output (Y*) when prices are sticky. | Vertical at Y* – economy’s productive capacity. |
| Price level changes → output changes. | Price level changes → no impact on output. |
SRAS Equation
( Y = f(P, \text{wage}, \text{prices}) )
5. Inflation & Deflation
| Type | Definition | Primary Causes |
|---|---|---|
| Demand‑Pull | Excess aggregate demand over supply. | Expansionary fiscal/monetary policy, external shocks. |
| Cost‑Push | Rising input costs (wages, raw materials). | Supply shocks, wage‑price spiral. |
| Built‑In | Adaptive expectations → wage‑price spiral. | Past inflation expectations. |
| Deflation | Persistent fall in price level. | Excess supply, reduced demand, liquidity trap. |
Inflation Measurement
- Consumer Price Index (CPI)
- Wholesale Price Index (WPI)
- GDP Deflator: ( \frac{Nominal\ GDP}{Real\ GDP} \times 100 )
6. Fiscal Policy
| Tool | Expansionary | Contractionary |
|---|---|---|
| Government Spending (G) | ↑ G | ↓ G |
| Taxation (T) | ↓ T | ↑ T |
| Transfer Payments | ↑ Transfers | ↓ Transfers |
6.1 Multiplier Effect
- Simple (Tax) Multiplier: ( \frac{1}{1-MPC} )
- Government Spending Multiplier: ( \frac{1}{1-MPC(1-t)} )
- Effective Multiplier: ( \frac{1}{1-MPC(1-t)+\frac{MPS}{1-MPC(1-t)}} )
Fiscal Gap = ( G + T_{transfer} – T_{tax} – G_{transfer} )
7. Monetary Policy
| Instrument | Conventional (Open‑Market) | Unconventional |
|---|---|---|
| Reserve Ratio | ↑ RR → ↓ money supply | ↓ RR → ↑ money supply |
| Repo/Reverse Repo | ↑ Repo rate → ↓ money supply | ↓ Repo |