EKONOMIE 144: Principles of Macroeconomics Exam Notes

EKONOMIE 144: Principles of Macroeconomics focuses on how economies behave at the “whole-economy” level—think national output, unemployment, inflation, interest rates, government budgets, and international trade. These exam notes give you the concepts, models, and step-by-step reasoning needed to answer typical macro questions: short definitions, diagram-based explanations, and numerical or “interpret the data” problems. The emphasis is on the kinds of topics commonly assessed in South African first-year macro modules across universities and TVET colleges, with practical examples that reflect real policy debates in South Africa and comparable emerging economies.

Section 1: Macroeconomic Measurement, National Accounts, and the Core Data You Must Know

Macroeconomics begins with measurement. If you cannot correctly interpret GDP, inflation, unemployment, and government budget balances, you will struggle to explain “why” and “what to do” in the economy. Examiners often test whether students can move from definitions to computations and from computations to interpretation.

1.1 Gross Domestic Product (GDP): What It Measures and Why It Matters

GDP is the market value of all final goods and services produced within a country’s borders in a given period (usually a year). The phrase “final” is crucial: intermediate goods (like flour used to bake bread) are not counted again when they appear in final products.

There are three equivalent approaches to measuring GDP:

Expenditure approach (Y = C + I + G + NX)
- C = household consumption
- I = investment (often interpreted as capital formation; includes business investment and some inventories)
- G = government expenditure
- NX = net exports = exports − imports
Income approach
- GDP is the sum of incomes generated by production: wages, rents, profits, and taxes minus subsidies (depending on classification).
Production approach
- GDP is the sum of value added at each stage of production.

Numerical Example (Expenditure Approach)

Assume a simplified economy has:

C = 1,200
I = 300
G = 200
Exports = 250
Imports = 150

Then:

NX = 250 − 150 = 100
GDP (Y) = 1,200 + 300 + 200 + 100 = 1,800

In exams, you may be asked to identify which component of GDP changes when:

households become more optimistic (often C rises),
firms buy more machinery (often I rises),
the government increases public services (often G rises),
the currency depreciates (often NX improves initially, though in the short run imports can remain expensive).

1.2 Real GDP vs Nominal GDP and Inflation’s Role

Nominal GDP values output using current-year prices. Real GDP adjusts for price changes (inflation) to measure changes in physical production more accurately.

A core idea:

If prices rise but quantities don’t, nominal GDP increases while real GDP stays flat (or changes less).

Simple Inflation Adjustment

If:

Nominal GDP = 2,400
Price index (deflator) = 1.20 relative to a base year

Then:

Real GDP = 2,400 / 1.20 = 2,000

If the deflator changes, it affects nominal-to-real conversion.

1.3 Consumer Price Index (CPI) and Producer Price Index (PPI)

In South African exam settings, you should distinguish:

CPI (Consumer Price Index): measures price changes for a basket of consumer goods (households).
PPI (Producer Price Index): measures price changes for goods at the producer/wholesale level.

CPI is often used to track inflation and to adjust wages, pensions, and some government benefits.

1.4 Unemployment Rate (U) and Labour Market Measurement

The unemployment rate is usually:

Unemployed / labour force × 100

Where:

Unemployed = people without work but actively seeking work.
Labour force = employed + unemployed (not including people who are discouraged and not actively looking).

So, if job seekers become discouraged and stop searching, the unemployment rate can fall even while labour market conditions worsen. This nuance often appears in exam questions about interpreting unemployment data.

1.5 Government Budget Balance: Deficit, Surplus, and Public Debt Basics

A government budget balance is typically:

Revenue − Expenditure
If revenue > expenditure: surplus
If expenditure > revenue: deficit

Exams often ask you to relate fiscal outcomes to macro variables:

Deficits may increase total demand if government spending rises.
Over time, deficits contribute to public debt, affecting interest costs and fiscal sustainability.

Link to Aggregate Demand (AD)

Using the macro identity:

Y = C + I + G + NX
an increase in G (government spending) can raise output Y, assuming other things constant (at least in the short run).

1.6 Balance of Payments and Exchange Rate Connection (Conceptual)

Although EKONOMIE 144 may not go deeply into balance-of-payments accounting in every course outline, you should know the broad link:

Export receipts and import payments affect demand for domestic and foreign currency.
Exchange rates influence NX through competitiveness and import costs.

Key takeaway

Macroeconomic indicators are interconnected. GDP, inflation, employment, the budget, and trade often move together, but not in perfectly predictable ways due to time lags, expectations, and structural differences.

1.7 Typical Exam-Style Prompts and How to Answer Them

Common exam tasks:

Define GDP and distinguish between real and nominal GDP.
Explain why the unemployment rate may fall while welfare declines.
Compute GDP from given C, I, G, exports, imports.
Interpret a rise in CPI and describe likely effects on real incomes.

Good answering structure:

Define the term precisely.
State the formula/relationship (if quantitative).
Interpret the result in macro terms.
Mention a reason that could explain the phenomenon (e.g., measurement issue, structural unemployment).

This measurement foundation will also support your understanding of macro models like Keynesian cross, AD-AS, and the IS-LM framework (if included), as well as monetary and fiscal policy.

Section 2: Aggregate Demand, the Keynesian Cross, and Macroeconomic Fluctuations

Once you can measure macro outcomes, the next exam focus is explaining how the economy moves up and down. In many introductory macro courses across South Africa (including curricula aligned with standard principles), the Keynesian approach is central: prices may be sticky in the short run, so changes in demand lead to output changes.

2.1 Aggregate Demand (AD): Meaning and Components

Aggregate Demand (AD) is the total planned spending on domestic output. In the expenditure form:

AD = C + I + G + NX

But in more model-based macro, AD is often expressed as a function of the price level (P) or the real interest rate. Depending on the lecturer’s approach, AD can be described as:

falling in price level (higher prices reduce real balances and competitiveness)
influenced by fiscal policy (G and taxes)
influenced by monetary policy (interest rates)

Short-run “price stickiness” idea

In Keynesian analysis:

wages and prices do not adjust instantly,
so output can change significantly in response to changes in AD.

2.2 The Keynesian Cross Model: Planned Expenditure and Equilibrium Output

A simple Keynesian cross model sets planned spending equal to actual output.

Key elements:

Planned Expenditure (PE) depends on income Y
Equilibrium occurs when:
- Y = PE

Example: Consumption Function

Suppose:

C = a + bY
where:
a = autonomous consumption (spending even when income is zero)
b = marginal propensity to consume (MPC), 0 < b < 1

Then:

PE = C + I + G

Substitute C:

PE = a + bY + I + G

Equilibrium:

Y = a + bY + I + G

Solve:

Y − bY = a + I + G
(1 − b)Y = a + I + G
Y = (a + I + G) / (1 − b)

2.3 The Multiplier: How Spending Changes Output More Than It Directly Does

The Keynesian multiplier captures the idea that an initial rise in spending leads to further income generation and further consumption.

If:

MPC = b
then the simple multiplier is:
Multiplier = 1 / (1 − b)

Concrete Example

Let:

a = 50 (autonomous consumption)
b = 0.8 (MPC)
I = 100
G = 150

Then:

Initial planned components excluding bY: a + I + G = 50 + 100 + 150 = 300
1 − b = 0.2
Multiplier = 1 / 0.2 = 5

Equilibrium income:

Y = 300 × 5 = 1,500

Now suppose government increases G by 20:

G increases to 170 (ΔG = +20)
Direct effect on PE is +20
Total change in equilibrium output:
- ΔY = multiplier × ΔG = 5 × 20 = +100

So:

new Y = 1,500 + 100 = 1,600

This is the kind of numerical logic that frequently appears in macro exams.

2.4 Policy Implications: Fiscal Expansion and the Short Run

If the economy is below potential output, a fiscal expansion (higher G or lower taxes) can increase demand and raise output. But exams often want you to also mention:

the possibility of crowding out (higher interest rates reduce I),
time lags (policy may take time to implement),
leakages (higher imports reduce NX, reducing the multiplier effect in open economies).

2.5 Consumption, Savings, and Marginal Propensities

Students often memorize definitions but lose points when asked to reason with them. Ensure you can relate:

MPC to how consumption responds to income
MPS (marginal propensity to save), where:
- MPS = 1 − MPC

If MPC is high (say 0.8), then MPS is low (0.2), so the multiplier is large. But if MPC is low (0.5), multiplier is smaller:

multiplier = 1 / (1 − 0.5) = 2

Real-world interpretation relevant to South Africa

In economies with high unemployment, low income, or credit constraints, consumption behavior can be complex. MPC may be affected by:

informal incomes,
access to credit,
precautionary saving due to uncertainty.

Even if a model uses a constant MPC, exam answers can mention that MPC varies by economic conditions.

2.6 Inflation and Output: Keynesian vs Classical Intuition (High-Yield Comparison)

Keynesian intuition:

In the short run, output responds to demand.
Inflation may increase if demand rises beyond capacity.

Classical/long-run view (often in later chapters):

In the long run, prices and wages adjust; output returns to potential.
Inflation is mainly influenced by monetary growth and expectations.

In most intro macro exam sequences, you’re expected to distinguish:

short-run fluctuations driven by demand and sticky prices,
long-run outcomes where supply constraints dominate.

2.7 Why Economies Fluctuate: Shocks and Expectations

Typical macro fluctuations come from:

demand shocks (consumer confidence, interest rates),
supply shocks (oil prices, droughts, input shortages),
policy shocks (fiscal austerity, monetary tightening),
external shocks (global recession, exchange rate movements).

Students can gain marks by linking shocks to AD or AS:

An increase in oil prices can reduce real income (lower C) and raise costs (affect AS).
A sudden drop in exports reduces NX (lower AD).

2.8 Exam Tips: Diagram Logic You Should Be Able to Reproduce

Even when not explicitly asked for diagrams, examiners value correct reasoning. In a Keynesian cross question:

draw PE vs Y line,
show a 45-degree line for Y = PE,
locate equilibrium at intersection.

Key statements to include in written responses:

Equilibrium output occurs where planned expenditure equals output.
Shifts in PE (from I, G, or C changes) lead to new equilibrium income.
The multiplier translates initial spending changes into larger output changes.

Section 3: Aggregate Supply, AD-AS, Inflation Dynamics, and Stabilisation (Including Policy Trade-offs)

The Keynesian cross is often taught as a stepping stone. But real exam questions frequently involve the AD-AS framework: both output and the price level matter simultaneously. This section builds your ability to explain short-run inflation/output trade-offs and the role of monetary and fiscal policy in stabilisation.

3.1 Aggregate Supply (AS): Short-Run vs Long-Run

Aggregate Supply is the total output firms are willing to produce at each price level.

A common intro macro structure:

Short-Run Aggregate Supply (SRAS): upward sloping due to sticky wages/prices, input costs, and firms adjusting production with the price level.
Long-Run Aggregate Supply (LRAS): vertical at potential output (Y*), assuming the economy’s productive capacity determines output in the long run.

Why SRAS slopes upward

If the price level increases unexpectedly:

firms may see revenues rise faster than costs (or costs adjust slowly),
profit opportunities increase,
production expands in the short run.

In exams, you should link SRAS upward slope to sticky wages/prices and short-run misperceptions.

3.2 AD-AS: Effects of Shifts on Output and the Price Level

In the AD-AS model:

AD shifts affect both output (Y) and the price level (P).
SRAS shifts also change inflation and output.

Typical cases

Demand-pull inflation
- AD shifts right
- output rises above potential (in short run)
- price level rises
Cost-push inflation
- SRAS shifts left (e.g., higher input costs)
- output falls (or growth slows)
- price level rises (stagflation-like outcome)
Supply improvements
- SRAS shifts right (productivity gains)
- output rises and/or inflation decreases (depending on AD)

3.3 The Potential Output Concept and the Output Gap

Potential output (Y*) is the sustainable level of output when resources are used normally and the economy is not in a deep boom or recession.

If actual output > potential: positive output gap → upward pressure on inflation.
If actual output < potential: negative output gap → downward pressure on inflation.

Exams sometimes ask you to connect:

recession indicators (high unemployment, idle capacity)
to:
falling inflation expectations (if demand weak).

3.4 Stabilisation Policy: Monetary vs Fiscal Policy in the AD-AS World

Monetary policy

Monetary policy often influences:

interest rates,
consumption (through borrowing costs),
investment,
exchange rates (through capital flows and currency value),
and therefore AD.

In many intro versions:

tighter monetary policy reduces AD,
which reduces output in the short run and lowers inflation.

Fiscal policy

Fiscal policy influences:

aggregate demand directly through G,
and indirectly through taxes (disposable income and consumption),
and potentially interest rates and investment through credit markets.

Expansionary fiscal policy increases AD:

can raise output in short run,
but risks higher inflation if economy approaches capacity.

3.5 A Policy Trade-off: Output Stabilisation vs Inflation Stabilisation

If the economy faces inflation due to demand:

reducing AD can lower inflation but creates output loss.

If the economy faces inflation due to cost shocks:

lowering AD reduces inflation partially, but may also reduce output further.

This is a classic reason why exams ask for “policy limitations.” In South African contexts, students often link this to:

exchange rate volatility affecting imported inputs,
electricity supply constraints affecting production costs,
food price shocks affecting CPI and demand.

3.6 Back-to-Back Numerical Interpretation: AD Shift and SRAS Response

Consider a simplified setup:

AD shifts right by some amount
short-run equilibrium moves from (P1, Y1) to (P2, Y2)

If SRAS remains unchanged:

you will observe:
- P increases
- Y increases, possibly beyond potential if AD is strong

But if SRAS is also changing due to cost shocks:

SRAS left shift means output can decline while prices rise, altering the net effect.

In many exam scripts, the best students explicitly mention:

“To determine the net effect on P and Y, we must compare AD shift direction and SRAS shift direction.”

3.7 Expectations and Inflation Persistence (High-Value Concept)

Even in an introductory module, you should understand that inflation is not purely mechanical.

Expectations of future inflation can influence:

wage bargaining,
price-setting behavior,
contract indexing.

If workers expect inflation to remain high:

they demand higher nominal wages,
which can sustain SRAS or keep inflation sticky.

This is why policy credibility matters. Tightening monetary policy may reduce inflation, but if expectations remain anchored poorly, inflation can remain elevated.

3.8 Inflation Measurement and Real Economic Effects

Inflation affects:

real wages (if nominal wages don’t rise at the same pace),
real interest rates,
purchasing power.

A question might ask:

“If nominal interest rates rise by 5% while inflation is 4%, what happens to real interest rates?”
Real interest rate approximation:
r ≈ i − π

If:

i increases by 5%
inflation π = 4%
then r increases by ~1% (real rates rise slightly), which can reduce investment.

3.9 “Stagflation” Scenario: Cost Shocks and Both Problems at Once

A high-yield diagram scenario:

SRAS shifts left (cost-push)
AD stays same
equilibrium output falls while price level rises

In an answer:

Identify the cause (cost shock).
Show SRAS shift left.
Explain output decline due to higher costs and reduced production.
Explain price rise due to lower supply and higher unit costs.
Explain policy difficulty: both stabilising inflation and preventing recession require careful balancing.

Section 4: Money, Banking, the Interest Rate, and Monetary Policy Transmission

Macroeconomic policy depends heavily on monetary mechanisms: how central banks influence money supply, interest rates, and credit conditions. Intro macro exams frequently test conceptual steps: from policy rate changes to output and inflation via AD.

4.1 Money: Functions and Measures

Money is used as:

a medium of exchange,
a unit of account,
and a store of value.

Common monetary aggregates in textbooks:

M1 (narrow money; includes cash and demand deposits)
M2 (broader; includes savings deposits)
sometimes M3 depending on system

Even if your specific syllabus names particular aggregates, the key is to understand:

monetary policy can influence these aggregates and the interest rates that guide borrowing/lending.

4.2 Banking System Basics: Creation of Money via Credit

A modern financial system:

accepts deposits,
makes loans,
and through fractional reserve banking can expand deposits relative to reserves (in simplified models).

In exam explanations, emphasize:

banks use deposits to fund loans,
lending affects money creation,
and credit conditions influence aggregate demand.

4.3 Central Bank Policy Tools

Central banks (e.g., in South Africa, the South African Reserve Bank) typically influence monetary conditions through:

policy interest rates (e.g., repo-related policy rate),
open market operations,
reserve requirements (less used in some systems today),
and liquidity management.

In introductory macro, you often focus on:

a change in policy rate leads to changes in market interest rates.

4.4 The Interest Rate Channel: Step-by-Step Transmission to AD

A classic chain:

Central bank changes policy rate (tightens or eases).
Market interest rates adjust.
Borrowing costs for households and firms change.
Consumption and investment respond.
AD changes.
Output and inflation respond (short run vs long run).

Example: Monetary Tightening

If central bank raises policy rate:

loan interest rates rise,
households postpone car purchases and home loans,
firms reduce capital expenditure,
investment (I) falls,
AD decreases,
output falls (or grows slower),
inflation declines over time.

4.5 Quantitative Illustration of AD Effects via Interest-Rate Sensitivity (Conceptual)

Some exam questions present a function like:

Investment I = I0 − d·r

If interest rate rises by Δr, investment falls by d·Δr. Then:

ΔAD = ΔI (if other components fixed),
equilibrium output changes according to the multiplier.

Even if your course does not require exact IS-LM computations, knowing how to reason with interest-rate-sensitive components is valuable.

4.6 Money Supply/Velocity and the Quantity Theory (When Taught)

If your module covers basic quantity theory ideas:

MV = PY

Where:

M is money supply,
V velocity,
P price level,
Y real output.

In exams, you may be asked:

If M grows quickly and V is stable, inflation tends to rise.
If output Y is at potential, more money growth goes into P rather than Y.

This links to long-run macro view: inflation is often sustained by monetary expansion in the long run.

4.7 Inflation Targeting and Policy Credibility (South Africa-Style Context)

South Africa has operated with inflation-focused monetary policy frameworks and communicates policy decisions publicly. You can earn marks by mentioning:

Inflation targeting aims to anchor expectations.
Credibility helps prevent wage-price spirals.
The central bank responds to forecasts, not only current inflation.

In exam answers:

“If expectations are anchored, the same policy tightening produces a faster inflation decline with less output loss.”
This is often a correct and well-reasoned statement.

4.8 The Liquidity/Bank Lending Channel (Conceptual but Useful)

Interest rate changes may not transmit effectively if:

banks are cautious due to non-performing loans,
firms cannot obtain credit even if rates fall,
the banking sector is stressed.

So sometimes:

monetary easing does not increase lending as much as expected,
meaning AD may not rise sufficiently.

Even when not using advanced models, acknowledging the credit channel is good macro literacy and often helps interpret real news data.

4.9 Monetary Policy in the Presence of a Supply Shock

If inflation is driven by cost-push factors:

tightening monetary policy reduces demand,
but supply constraints remain (prices keep rising or remain high).

So exams sometimes ask for:

“why monetary policy alone may not solve inflation if supply is constrained.”
Your answer should mention:
supply-side interventions (energy reliability, logistics improvements, agricultural productivity) alongside macro stabilisation.

4.10 Exam-Ready Answer Template for Monetary Policy Questions

When asked: “How does monetary policy affect inflation and output?”
Use this structure:

State policy action (tighten/ease).
Transmission mechanism (interest rate → borrowing/investment/consumption).
AD effect (AD shifts left/right).
Short-run outcome (output and inflation move depending on SRAS).
Long-run outcome (output returns to potential; inflation depends on credible policy/expectations).

This ensures your answer is not just description but a coherent causal chain.

Section 5: Open Economy Macroeconomics, Exchange Rates, Trade, and Policy Coordination (with South African Relevance)

Many South African students struggle here because they treat exchange rates and net exports as “extra topics.” But in real macro, exchange rates connect domestic variables (inflation, growth, unemployment) to external conditions (global demand, commodity prices, capital flows). This section ensures you can handle open economy content confidently in exams.

5.1 Net Exports (NX) and the Exchange Rate

Recall:

NX = Exports − Imports

Exchange rate depreciation (domestic currency weaker) tends to:

make domestic goods cheaper for foreigners → exports rise,
make imports more expensive for domestic consumers → imports fall,
thus NX improves—but usually with a lag due to contracts, adjustment costs, and consumption habits.

This short-run adjustment lag is frequently tested qualitatively.

5.2 The Trade Balance and Capital Flows

Even if NX improves, the current account can be influenced by:

global income,
commodity prices,
investor sentiment,
capital inflows/outflows.

Exams might ask you to link:

weaker exchange rates to higher import prices and inflation,
and to the cost of foreign-currency denominated debt.

A coherent answer:

Depreciation raises import prices.
Higher import prices raise CPI (through direct and indirect pass-through).
Higher inflation can raise nominal interest rates (or policy rates may need to remain tight).
Higher interest rates slow domestic demand (output effects).

5.3 Exchange Rate and Inflation Pass-through (Conceptual)

Pass-through is how much of exchange rate changes show up in domestic prices. It depends on:

import share in consumption and production,
exchange rate volatility and inflation expectations,
price-setting behavior of firms.

For exam purposes, emphasize:

depreciation does not instantly move CPI by the full percentage,
the effect often unfolds over several months.

5.4 Aggregate Demand in an Open Economy

In open economy macro:

AD = C + I + G + NX(e)

If exchange rate changes:

NX changes,
AD changes,
output and inflation change (depending on AS).

Therefore, exchange rate movements affect macro outcomes even when domestic policy does not change.

5.5 Fiscal Policy in an Open Economy: More Nuanced Effects

Fiscal expansion (higher G or lower taxes) increases AD:

but in open economies, it can raise interest rates,
attracting capital inflows,
causing currency appreciation,
which reduces NX.

This is crowding out via exchange rates. So fiscal stimulus may have a smaller output effect than in a closed economy.

In exam answers, you can earn marks by stating both:

direct positive impact on AD through G,
indirect negative impact on NX through appreciation.

5.6 Monetary Policy in an Open Economy: Interest Rate Differentials

Monetary tightening:

can raise domestic interest rates,
attract foreign capital,
strengthen currency,
reduce NX,
dampening inflation further.

But again, timing and magnitude vary.

If your exam includes a statement evaluation:

“Monetary policy is more effective in small open economies.”
A strong response would be:
it depends on exchange rate pass-through, capital mobility, and credibility.

5.7 Commodity Dependence and External Shocks (South Africa-Relevant)

South African macro debates often involve external shocks such as:

global energy price changes (imported fuel and electricity input costs),
food price changes (imported staples and supply disruptions),
global demand changes (impacting export volumes and investor confidence).

A supply shock transmitted through imports can cause:

SRAS left shift (cost-push),
depreciation/financial conditions that feed inflation,
resulting in both lower output and higher prices (stagflation risk).

In exam writing:

identify whether the shock is mainly demand-side or supply-side,
then describe the AD-AS consequences accordingly.

5.8 Worked Case: A Depreciation Shock and AD-AS Consequences

Let’s craft an internally consistent scenario for exam-like reasoning.

Assume:

The economy is initially producing at potential output Y* and inflation is stable (as per baseline equilibrium).
A depreciation occurs (weaker currency).
Effects:
1. Import prices rise → firms’ costs increase → SRAS shifts left (cost-push).
2. Export competitiveness improves but only partly/slowly → NX increases somewhat; AD may shift slightly right, but not enough initially.

Net effect described qualitatively in typical models:

SRAS left dominates in the short run:
- output falls below potential,
- inflation rises.

Then, monetary policy responses may be:

maintain tighter conditions to contain inflation,
but output loss remains due to cost shock.

This is the logic behind many “interpret the graph” questions.

5.9 Exchange Rate Regimes and Policy Constraints

Exams sometimes ask:

“What is the difference between fixed and floating exchange rates for macro policy?”

Key points:

With fixed exchange rates, monetary policy may be constrained because the central bank must defend the exchange rate.
With floating rates, the exchange rate adjusts, helping absorb shocks, but it can create exchange-rate volatility and inflation pass-through risks.

For written answers:

mention both stabilisation and side effects:
- floating can be stabilising via competitiveness adjustments,
- but it can destabilise inflation via import prices.

5.10 Policy Coordination and Trade-offs: The “Three-Legged Stool”

A coherent macro stabilisation approach involves:

Monetary policy (inflation control via interest rates and liquidity management)
Fiscal policy (stabilising demand; funding and sustainability constraints)
Supply-side policy (productivity, labour market reforms, energy and logistics reliability)

In South African settings, purely demand-side policy may not fix structural supply constraints (e.g., energy interruptions, logistics cost burdens). Exams may ask for a policy recommendation—your strongest answer often mentions supply-side measures as well as macro stabilisation.

5.11 Exam Question Patterns and How to Score High

Common open economy exam prompts:

“Explain how a depreciation affects inflation and output.”
- answer must mention: SRAS costs, AD via NX, time lags, pass-through.
“Explain whether fiscal stimulus is more or less effective in an open economy.”
- answer must mention: exchange rate appreciation channel, NX changes, capital flows.
“Discuss policy trade-offs during cost-push inflation.”
- answer must mention: stabilisation difficulty, output-inflation trade-off, supply constraints.

Conclusion: What to Master for EKONOMIE 144 Exam Success

To score well in EKONOMIE 144: Principles of Macroeconomics, you must master both measurement and model reasoning. Measurement topics (GDP composition, inflation indicators, unemployment definitions, budget balances) ensure you can interpret real data. Models (Keynesian cross and AD-AS) ensure you can answer “what happens if…” questions logically and draw correct causal chains: how AD and AS shift, what that does to output and the price level, and how policy can stabilise the economy—alongside the limitations created by supply shocks, expectations, exchange rates, and credit conditions.

Finally, you should train yourself to convert theory into exam outputs:

compute GDP using C + I + G + NX when given numbers,
compute multiplier effects using 1/(1 − MPC),
interpret AD-AS diagrams by stating directional changes for P and Y,
and explain policy transmission in step-by-step causal form.

If you can do those tasks reliably under time pressure, you are prepared not only to pass but to write the type of coherent, high-scoring macro explanations that examiners reward.