GDP measures the value of everything produced in a country in a year. Growth in GDP raises average living standards.
🧮 Measuring GDP
GDP is the total value of final goods and services produced within a country in a period. The expenditure approach: GDP = C + I + G + (X − M) — consumption, investment, government spending and net exports. Nominal GDP uses current prices; real GDP removes inflation. GDP per capita = GDP ÷ population. GDP leaves out unpaid work, the black economy and environmental damage.
C 700, I 200, G 250, X 150, M 100
GDP = 700 + 200 + 250 + (150 − 100) = 1200
GDP per capita = 1200 bn / 20 m = $60 000
🖼️ See it
Money paid out as incomes comes back as spending: total spending equals total output equals total income.GDP grows over the long run (dashed trend) but swings above and below it in booms and slumps.
📈 Growth and its limits
Economic growth is the percentage rise in real GDP: (new − old) ÷ old × 100. Sources: more capital, better skills, technology and higher productivity. The business cycle has expansion, peak, recession (two quarters of falling GDP) and trough. Growth may raise pollution and inequality, so many also use measures like the HDI and “green GDP”.
real GDP: 1000 → 1030: growth = 30/1000 = 3%
rule of 70: 3% growth doubles in 70/3 ≈ 23 years
Real GDP per person is the better yardstick. Total GDP can rise just because the population does.
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GDP
GDP measures:
Total production.
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Components
In GDP = C + I + G + (X − M), “I” stands for:
Capital spending.
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Recession
A recession is commonly defined as:
Falling output.
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Real GDP
Real GDP differs from nominal GDP because it:
Removes price changes.
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C = 700, I = 200, G = 250, X = 150, M = 100.
What is GDP?
Enter an exact answer, without rounding.
Add all components.
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Real GDP rises from 1000 to 1030.
What is the growth rate, in %?
Enter an exact answer, without rounding.
%
Change ÷ original.
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GDP is $1200 billion and population is 20 million.
What is GDP per capita, in $?
Enter an exact answer, without rounding.
$
Convert to millions first.
📝 Lesson quiz · 5 questions
0 / 5
Re-read the lesson, then give it another go.
Question 1 of 5
Which is NOT included in GDP?
Question 2 of 5
Net exports equal:
Question 3 of 5
Which is a source of long-term growth?
Question 4 of 5
A trough is:
Question 5 of 5
GDP per capita is a better indicator of living standards than GDP because it:
Lesson 2 · Macroeconomics
🏛️ Fiscal Policy
Governments use taxes and spending to influence the economy. Their choices affect jobs, prices and debt.
💸 Taxes and spending
Fiscal policy changes government spending and taxation. Expansionary fiscal policy (more spending or lower taxes) boosts demand in a recession. Contractionary policy (less spending or higher taxes) cools an overheating economy. The multiplier says an initial injection raises GDP by more than its size: multiplier = 1 ÷ (1 − MPC), where MPC is the marginal propensity to consume.
MPC = 0.8 → multiplier = 1 / 0.2 = 5
government spends $10 bn extra → GDP rises by up to 10 × 5 = $50 bn
MPC = 0.5 → multiplier = 2
🖼️ See it
📉 Deficits and debt
A budget deficit = spending − tax revenue; the national debt is the accumulated total. The debt-to-GDP ratio is a measure of sustainability. Debt can fund useful investment but high interest payments reduce spending on other things. Automatic stabilisers (unemployment benefits, progressive taxes) cushion recessions without new decisions. Critics warn of crowding out private investment; supporters point to the role of public investment.
debt $2.4 trillion, GDP $3 trillion → debt/GDP = 80%
automatic stabiliser: in a recession tax receipts fall and benefits rise
Fiscal policy has time lags. By the time spending takes effect the economy may have already changed.
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Expansionary
Expansionary fiscal policy involves:
Stimulus.
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Stabiliser
An automatic stabiliser is:
Built in.
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Debt
National debt is:
Total owed.
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Crowding out
Crowding out means that government borrowing:
Pushes out.
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MPC = 0.8.
What is the multiplier?
Enter an exact answer, without rounding.
1 ÷ (1 − MPC).
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The multiplier is 5 and the government spends an extra $10 billion.
How large is the potential rise in GDP, in $ billion?
Enter an exact answer, without rounding.
$ bn
Spending × multiplier.
✍️ Type your answer · 7 of 7
Debt is $2.4 trillion and GDP is $3 trillion.
What is the debt-to-GDP ratio, in %?
Enter an exact answer, without rounding.
%
Divide, ×100.
📝 Lesson quiz · 5 questions
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Re-read the lesson, then give it another go.
Question 1 of 5
A progressive tax system acts as a stabiliser because:
Question 2 of 5
Contractionary fiscal policy is used when:
Question 3 of 5
A larger MPC gives:
Question 4 of 5
A budget surplus means:
Question 5 of 5
The debt-to-GDP ratio shows:
Lesson 3 · Macroeconomics
🏦 Monetary Policy & Banking
Central banks steer the economy by controlling the cost and supply of money.
🎚️ The central bank’s tools
Central banks (the Federal Reserve, ECB, Bank of England) set a policy interest rate, run open market operations (buying and selling bonds), set reserve requirements and act as lender of last resort. Quantitative easing (QE) creates money to buy bonds when rates are near zero. Commercial banks create money when they lend: with a reserve ratio of 10%, a $1000 deposit can support up to $1000 ÷ 0.10 = $10 000 of deposits in total.
money multiplier = 1 / reserve ratio
reserve ratio 10% → multiplier 10
deposit $1000: bank keeps $100, lends $900, which is re-deposited…
🖼️ See it
The bank raises rates to do the reverse when inflation is too high.
⚖️ Transmission and limits
A rate cut lowers loan costs, raises investment and consumption, weakens the exchange rate and raises inflation. A rate rise does the reverse. Effects take 12–24 months. Limits: the zero lower bound and supply shocks that raise prices while output falls (stagflation). Banks can fail in bank runs, so deposits are insured and banks hold capital buffers (Basel rules).
mortgage $200 000 at 3% → interest $6000 a year
at 5% → $10 000 a year
increase = $4000
Monetary policy works slowly. Central banks look ahead, not at today’s data alone.
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Tool
The central bank’s main tool is its:
Rate.
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QE
Quantitative easing involves:
Buying bonds.
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Lender of last resort
A lender of last resort:
Emergency lender.
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Stagflation
Stagflation combines:
Stagnation plus inflation.
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The reserve ratio is 10%.
What is the money multiplier?
Enter an exact answer, without rounding.
1 ÷ reserve ratio.
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A bank holds a $1000 deposit with a 10% reserve ratio.
How much can the first bank lend, in $?
Enter an exact answer, without rounding.
$
Keep 10% in reserve.
✍️ Type your answer · 7 of 7
A mortgage of $200 000 changes from 3% to 5% interest per year.
How much more is paid in interest per year, in $?
Enter an exact answer, without rounding.
$
Difference in rate × loan.
📝 Lesson quiz · 5 questions
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Question 1 of 5
A bank run happens when:
Question 2 of 5
Lowering interest rates tends to:
Question 3 of 5
Deposit insurance protects:
Question 4 of 5
The zero lower bound means:
Question 5 of 5
Open market operations are:
Lesson 4 · International economics
💱 Exchange Rates & Trade
Currencies are traded like goods. Their prices affect trade, travel and investment.
💲 Exchange rates
An exchange rate is the price of one currency in terms of another. In a floating system, demand and supply for currency set it; in a fixed system the central bank pegs it. A stronger (appreciating) currency makes imports cheaper and exports dearer; a weaker (depreciating) currency does the opposite. Demand for a currency rises with exports, foreign investment, higher interest rates and confidence.
$1 = 0.90 euro
$200 → 180 euro
if the euro appreciates to $1 = 0.80 euro
$200 → 160 euro (the dollar is weaker)
🖼️ See it
The exchange rate is the price of one currency in terms of another, set by demand and supply.
📦 Balance of payments
The balance of payments records all transactions with the world. The current account includes trade in goods and services, income and transfers; the capital and financial account includes investment flows. A persistent current account deficit means a country imports more than it earns and must borrow. Trade policy tools: tariffs, quotas, subsidies. The WTO promotes lower barriers. The terms of trade = export price index ÷ import price index × 100.
exports 120, imports 150 → current account balance −30
terms of trade: 110 / 100 × 100 = 110 (improving)
A weaker currency is not simply good or bad. It helps exporters but raises prices of imports.
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Appreciation
If a currency appreciates, then imports become:
Stronger.
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Floating
In a floating exchange rate system the rate is set by:
Market forces.
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Depreciation
A depreciating currency generally helps:
Weaker currency.
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Current account
A current account deficit means:
More out than in.
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$1 = 0.90 euro.
How many euro is $200?
Enter an exact answer, without rounding.
euro
Multiply.
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Exports are 120 and imports are 150.
What is the trade balance?
Enter an exact answer, without rounding.
Exports minus imports.
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The export price index is 110 and the import price index is 100.
What are the terms of trade?
Enter an exact answer, without rounding.
Export ÷ import × 100.
📝 Lesson quiz · 5 questions
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Re-read the lesson, then give it another go.
Question 1 of 5
Higher interest rates in a country tend to:
Question 2 of 5
A fixed exchange rate requires:
Question 3 of 5
The WTO aims to:
Question 4 of 5
Improving terms of trade means:
Question 5 of 5
A tariff is a:
Lesson 5 · Comparative economics
🌍 Economic Systems & Development
Societies answer the questions of what, how and for whom to produce in different ways.
🧭 Systems compared
A market economy relies on prices and private firms; a command (planned) economy relies on government decisions (the USSR, North Korea); a mixed economy combines both, which describes almost all countries today. Market economies tend to be efficient and innovative but can produce inequality and externalities; planned economies can direct resources but often face shortages and weak incentives. Capitalism stresses private property; socialism stresses public ownership and equality.
market: prices decide
command: planners decide
mixed: USA, UK, India, Sweden (differing degrees)
private sector share of GDP: USA ~70%, Sweden ~50%
🖼️ See it
Real economies mix the two: private firms make most things while governments provide services and set rules.
🌱 Development and inequality
Development is about more than income: health, education and freedom (the HDI). Obstacles: conflict, poor institutions, debt, disease, poverty traps. Strategies: education, infrastructure, trade openness, microfinance, aid, good governance. The Gini coefficient (0–1) measures inequality; the Lorenz curve shows how far income distribution is from equality. Some inequality rewards effort, but extreme inequality harms growth and trust.
Gini 0 = perfect equality; 1 = one person has everything
Denmark ≈ 0.28; USA ≈ 0.41; South Africa ≈ 0.63
extreme poverty: below $2.15 a day
Development is a mix of income, health and education. Avoid judging by GDP alone.
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Mixed economy
A mixed economy combines:
Both.
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Command economy
In a command economy, who decides what to produce?
Central planners.
✏️ Quick check · 3 of 7
Gini
A Gini coefficient of 0 means:
Equality.
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Poverty trap
A poverty trap is:
Self-reinforcing.
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A country has Gini 0.63 and another 0.28.
What is the difference?
Enter an exact answer, without rounding.
Subtract.
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Private firms produce 70% of a $20 trillion economy.
How many trillion dollars is that?
Enter an exact answer, without rounding.
$ trillion
70% of 20.
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A person lives on $1.50 a day. The poverty line is $2.15.
How many dollars below the line is that?
Enter an exact answer, without rounding.
$
Subtract.
📝 Lesson quiz · 5 questions
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Re-read the lesson, then give it another go.
Question 1 of 5
Which is an advantage of a market economy?
Question 2 of 5
A drawback of central planning is often:
Question 3 of 5
The HDI includes:
Question 4 of 5
Microfinance gives:
Question 5 of 5
Good governance supports development by:
Final Challenge
🏆 10-Question Challenge Quiz
Questions from every topic in this course. Pick an answer for each one, then hit Check My Answers.
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💪 Keep practicing — go back through the lessons and retake the quiz!
Q1 · GDP & Economic Growth
Which would raise GDP through the expenditure approach?
Q2 · GDP & Economic Growth
GDP per capita is a better indicator of living standards than GDP because it:
Q3 · Fiscal Policy
The multiplier effect arises because:
Q4 · Fiscal Policy
The debt-to-GDP ratio shows:
Q5 · Monetary Policy & Banking
Why does monetary policy have time lags?
Q6 · Monetary Policy & Banking
Open market operations are:
Q7 · Exchange Rates & Trade
If a country’s currency depreciates, its holiday destinations become: