ICWIM Chapter 5 Deep Dive: Macro Indicators

ICWIM Chapter 5 (Economics & Investment Analysis) is 21 of 100 marks — the heaviest chapter on the exam. The first half is macroeconomic theory and indicators; the second half is financial mathematics. This guide tackles the macro half: every measurement definition, central bank tool, policy mechanism, and business-cycle indicator tested on the exam. Pair this with our formulas cheat sheet for the calculation half.

Measuring national output: GDP, GNP, GNI

Real vs Nominal

• Nominal GDP: measured in current prices
• Real GDP: adjusted for inflation using a base year

For year-on-year comparisons, real GDP is the right number. Nominal GDP "growth" can be entirely an inflation artefact.

Three approaches to calculating GDP

1. Output approach: sum the value-added across all industries
2. Expenditure approach: C + I + G + (X − M) [consumption + investment + government + net exports]
3. Income approach: sum of wages + rents + interest + profits

All three approaches give the same answer in theory. The expenditure formula Y = C + I + G + NX is the most exam-tested.

Measuring inflation: CPI, RPI, GDP deflator

CPI vs RPI is heavily tested. Common questions probe: which is HIGHER (RPI typically), which is used for STATE PENSION uprating (triple lock includes CPI), which is used for INDEX-LINKED GILTS (RPI historically).

Core vs Headline inflation

• Headline inflation: the full CPI/RPI as published
• Core inflation: headline minus volatile food & energy components

Central banks track core to see underlying trends without month-to-month volatility from oil prices.

Central bank tools

1. Interest rate policy

The headline tool. Central banks set their policy rate (Bank Rate in UK, Federal Funds Rate in US, Repo Rate in ECB). Higher rates → cooler economy, lower inflation. Lower rates → stimulus.

2. Open Market Operations (OMOs)

The central bank buys or sells government securities to inject or drain liquidity:

• Buy bonds → adds reserves to the banking system → rates fall, money supply rises
• Sell bonds → removes reserves → rates rise, money supply contracts

3. Reserve requirements

The minimum proportion of customer deposits banks must hold (not lend). Raising reserves contracts lending; lowering expands it.

4. Quantitative Easing (QE) / Quantitative Tightening (QT)

• QE: central bank buys long-dated government bonds (and sometimes corporates) to lower long-term yields, stimulate borrowing
• QT: the reverse — letting bonds mature without reinvestment, or actively selling them, contracts the central bank balance sheet

QE was deployed extensively post-2008 GFC and again during COVID-19. The withdrawal (QT) defines much of the 2022-2026 policy cycle.

5. Forward guidance

Communicating future policy intentions to shape market expectations. "Rates will remain low until employment recovers" is forward guidance — it works by changing expectations now, not just policy later.

Fiscal vs monetary policy

The business cycle

Economies move through phases — peak, contraction, trough, expansion — known as the business cycle. The standard four-phase model:

1. Peak (boom). Output above trend; unemployment low; inflation rising.
2. Contraction (recession). Output falling; unemployment rising; inflation easing.
3. Trough. Output at low point; spare capacity high.
4. Expansion (recovery). Output rising back to trend; unemployment falling.

Recession definition

The technical definition: two consecutive quarters of negative real GDP growth. This is the textbook answer; the NBER (US) and ONS (UK) use broader definitions in practice, but exams expect the two-quarter rule.

Economic indicators: leading, coincident, lagging

Common exam trap: unemployment is a LAGGING indicator, not a leading one. It rises after the recession has begun and falls only after the recovery is well established. Companies are slow to fire (to retain skilled workers) and slow to hire.

Balance of payments & the current account

The balance of payments records all economic transactions between a country and the rest of the world. Two main accounts:

By definition, current account deficits are balanced by financial account surpluses (foreign investors funding the deficit). The UK runs a structural current account deficit; Germany a structural surplus.

Exchange rate regimes

Money supply: M0 / M1 / M2 / M3 / M4

Each broader aggregate is less "liquid" but a better measure of total purchasing power in the economy. Central banks watch M2/M3 trends for inflation pressure.

The Phillips Curve and NAIRU

The Phillips Curve postulates an inverse relationship between unemployment and inflation: lower unemployment → higher inflation. The modern version recognises this relationship breaks down at the "natural rate of unemployment" (NAIRU — Non-Accelerating Inflation Rate of Unemployment).

• Unemployment below NAIRU → inflation accelerates
• Unemployment at NAIRU → inflation stable
• Unemployment above NAIRU → inflation decelerates

Central banks target inflation; unemployment outcomes are largely a consequence. NAIRU is estimated, not observed — and the estimate varies over time as the economy changes.

Other macro concepts on the exam

Quantity Theory of Money

Where M = money supply, V = velocity of money, P = price level, Y = real output. If V is stable and Y grows steadily, doubling M doubles P — i.e. money-supply growth = inflation. The simple intuition behind monetarism.

Crowding out

Fiscal expansion (more government borrowing) competes with private borrowers for funds, raising interest rates and "crowding out" private investment. Limits the multiplier effect of fiscal stimulus.

Twin deficits

The hypothesis that fiscal deficits and current-account deficits move together — when the government runs a deficit, the country imports more (financed by foreign capital). The US is the classic case.

Most-tested exam traps

Related guides

• ICWIM calculation formulas cheat sheet — the financial-maths half of Chapter 5
• ICWIM 8-week study plan — chapter-weighted prep
• Derivatives Payoffs in 8 Diagrams — Chapter 3 visual reference
• How to read the CISI workbook — apply the active-reading method to Ch 5

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