Macroeconomics: Output, Inflation and Employment

Macroeconomics studies aggregates — the level and growth of national output, employment, the price level, interest rates and the balance of payments. While microeconomics asks why bread is priced at Rs. 200, macroeconomics asks why the general price level changed.

National income accounting

The expenditure approach:

Y = C + I + G + (X − M)

• C: household consumption
• I: gross investment
• G: government purchases
• (X − M): net exports

Variants:

• GNP = GDP + net factor income from abroad.
• NNP = GNP − depreciation.
• National Income = NNP − indirect taxes + subsidies.
• Real GDP uses constant prices and is the proper measure of growth; Nominal GDP uses current prices.

For Pakistan, the Pakistan Bureau of Statistics (PBS) estimates GDP. Rebasing to 2015–16 in FY 2022 lifted measured GDP and changed sectoral weights — a regularly examined fact.

Aggregate demand and aggregate supply

AD is the total quantity of output demanded at each price level. It slopes downward because of:

• Wealth effect — lower prices raise real wealth, stimulating consumption.
• Interest-rate effect — lower prices reduce money demand, lowering interest rates and raising investment.
• Exchange-rate effect — lower domestic prices make exports cheaper.

AS in the short run slopes upward (sticky wages/prices); in the long run it is vertical at potential output.

Classical vs. Keynesian thought

Issue	Classical	Keynesian
Wages/prices	Flexible	Sticky
Say's Law	Holds (supply creates demand)	Rejects
Unemployment	Voluntary/frictional	Can be involuntary
Role of government	Minimal	Active fiscal policy
Speed of self-correction	Fast	Slow ("in the long run we are all dead")

The Keynesian Cross model treats the price level as fixed: equilibrium occurs where planned expenditure equals output. The multiplier is 1/(1 − MPC); an autonomous increase in investment of Rs. 100 with MPC = 0.8 raises income by Rs. 500.

Inflation

A sustained rise in the general price level. Measures:

• CPI (Consumer Price Index) — basket of consumer goods.
• WPI (Wholesale Price Index) — wholesale prices.
• GDP deflator — broadest, covers all domestic output.

Types

• Demand-pull — AD shifts right beyond capacity.
• Cost-push — supply shock (oil, wages); leads to stagflation (high inflation + unemployment).
• Built-in / wage-price spiral — adaptive expectations.

Costs of inflation

• Menu costs, shoe-leather costs.
• Redistribution from creditors to debtors.
• Distortion of long-term contracts and tax brackets.

The Fisher equation: i ≈ r + π^e (nominal = real + expected inflation).

Unemployment

Categories:

• Frictional — between jobs.
• Structural — skills mismatch (e.g., textile workers in Faisalabad displaced by automation).
• Cyclical — falls in AD during recession.
• Seasonal — agricultural workers in lean months.

The natural rate of unemployment is the rate at the long-run equilibrium (frictional + structural). The Phillips Curve posits a short-run trade-off between inflation and unemployment — broken in the 1970s by stagflation, prompting Friedman's expectations-augmented version: in the long run the Phillips Curve is vertical at the natural rate.

Business cycles

The classic four phases: expansion → peak → contraction → trough. Theories explaining cycles include:

• Keynesian demand-shock model.
• Real business cycle (Kydland–Prescott) — technology shocks.
• Monetarist — money-supply fluctuations.
• Financial accelerator (Bernanke) — credit-cycle amplification.

Money, interest rates and the IS-LM model

• IS curve: combinations of interest rate and income at which the goods market clears.
• LM curve: combinations at which the money market clears.
• Equilibrium at the IS-LM intersection. Fiscal expansion shifts IS right; monetary expansion shifts LM right.

Adding the labour market and price flexibility extends IS-LM to AD-AS.

Stabilisation policy

Fiscal policy

Government spending and taxation. Discretionary (deliberate changes) vs. automatic stabilisers (progressive taxes, unemployment benefits). Pakistan's federal budget is presented in June each year and tabled before Parliament under Article 80–84 of the Constitution.

Monetary policy

The State Bank of Pakistan, under the SBP Act 1956 (as amended in 2022), has price stability as its primary objective. Key instruments:

• Policy rate (target rate; the OMO repo rate corridor).
• Open Market Operations (OMOs).
• Cash Reserve Ratio (CRR) and Statutory Liquidity Requirement (SLR).
• Forex interventions.

Open-economy macro

• Balance of Payments = Current Account + Capital Account + Financial Account (with errors & omissions and changes in reserves).
• Real exchange rate = e × P*/P.
• Marshall–Lerner condition: a depreciation improves the trade balance only if the sum of export and import price elasticities exceeds one.
• J-curve: trade balance worsens initially after depreciation, then improves — relevant to Pakistan's repeated rupee devaluations.

Modern issues

• Inflation targeting under SBP's new mandate.
• Climate finance and green budgeting.
• De-globalisation and supply-chain reshoring.
• Digital currencies (CBDCs) and the future of payment systems.

A CSS-grade macro answer integrates theory with policy and Pakistani data, avoiding the pitfall of mere textbook recitation.