Module 1: Money & Prices
What money is, why prices change, and what interest rates actually do.
1. What is Money?(3 min)
Analogy: Imagine trying to trade a pizza slice for a haircut. Awkward, right? Money is the middle-man that makes trades easy.
Money is anything a lot of people agree to accept in exchange for stuff. Long ago it was salt, cows, shells or gold. Today it is mostly numbers in a bank app.
Money does three jobs: it lets you trade (pay for a game), it stores value (save it for later), and it measures value (this shirt costs $20).
Because everyone trusts the same money, you can walk into any shop and know exactly what a bar of chocolate costs. Without money, we would have to swap physical things every single time.
- Big idea: Money is a shared way to trade.
- Big idea: Money only works because we all trust it.
- Big idea: Modern money is mostly digital numbers.
- Currency:
- The type of money a country uses (dollars, euros, yen).
- Central bank:
- The government-linked bank that controls a country’s money.
2. Why Prices Go Up: Inflation(4 min)
Analogy: A pizza slice that cost £2 when you were in Year 7 might cost £3 by the time you finish school. That climb is inflation.
Inflation means prices going up over time. If inflation is 3% a year, something that costs £100 today will cost about £103 next year.
Inflation happens when there is more demand for stuff than supply, or when the government prints too much money, or when things like oil get more expensive.
A little bit of inflation (about 2%) is normal. A lot of inflation — like 20% or more — is a big problem because your savings buy less every month.
- Big idea: Inflation is prices rising over time.
- Big idea: A small amount is normal; a lot is dangerous.
- Big idea: Inflation quietly eats the value of savings.
- CPI:
- Consumer Price Index — a basket of things people buy, tracked over time to measure inflation.
- Deflation:
- The opposite of inflation — prices falling. Sounds nice but can freeze the economy.
3. The Cost of Borrowing: Interest Rates(4 min)
Analogy: If a friend lends you £10 and asks for £11 back next week, that extra £1 is interest — the price of borrowing.
When banks lend money, they charge extra on top. That extra is called interest, and how much extra is the interest rate.
A country’s central bank (like the Federal Reserve in the US or the Bank of England in the UK) sets a main interest rate. Everyone else copies it: mortgages, savings accounts, business loans.
When inflation is too high, central banks raise interest rates. This makes borrowing more expensive, so people spend less, so prices stop racing up. When the economy is weak, they cut rates to encourage spending.
- Big idea: Interest is the price of borrowing money.
- Big idea: Central banks use rates to control inflation.
- Big idea: Higher rates cool the economy; lower rates heat it up.
- Federal Funds Rate:
- The main US interest rate set by the Federal Reserve.
- Real rate:
- The interest rate after subtracting inflation. It tells you if you’re truly earning or losing.
4. How Banks Work(4 min)
Analogy: Your money in a bank app is not sitting in a box with your name on it. The bank has lent most of it to someone buying a house.
A bank takes deposits from savers and lends that money out to borrowers. It pays savers a small amount of interest and charges borrowers a bigger amount. The gap is how it makes money.
Banks only keep a slice of deposits as cash — the reserve. Because everyone rarely withdraws at once, a £100 deposit can end up supporting several hundred pounds of loans across the banking system. That ripple is called the money multiplier.
The system works on confidence. If enough people panic and demand their cash at the same time, even a healthy bank runs out — a bank run. That is what happened in 2008, and why governments now guarantee deposits up to a limit.
- Big idea: Banks turn deposits into loans and earn the gap.
- Big idea: Only a fraction of deposits is kept as cash.
- Big idea: Banking runs on confidence — lose it and the bank fails.
- Reserve ratio:
- The share of deposits a bank must keep on hand instead of lending out.
- Bank run:
- When lots of customers withdraw at once and the bank runs out of cash.
- Deposit insurance:
- A government promise to repay your savings (up to a limit) if your bank fails.
5. Currencies & Exchange Rates(4 min)
Analogy: Going on holiday abroad? Your money has to be swapped for the local money first. The swap rate is called the exchange rate.
Different countries use different money. £1 might buy $1.25 today and $1.30 tomorrow. That changing swap rate is the exchange rate.
Exchange rates move because of trade, interest rates, politics and how much investors trust a country. A strong currency buys more of others.
When a currency gets weaker, foreign holidays and imported gadgets get more expensive at home. When it gets stronger, they get cheaper.
- Big idea: Exchange rates are the price of one money in another.
- Big idea: Rates change all the time based on trust and interest rates.
- Big idea: A stronger currency = cheaper imports and holidays.
- FX:
- Short for "foreign exchange" — the market where currencies are swapped.
- Reserve currency:
- A currency (like the US dollar) that many countries hold in their savings.
Module 2: The Economy
How we measure a country: jobs, growth, debt and fairness.
6. GDP: How Big Is a Country’s Economy?(4 min)
Analogy: Imagine every lemonade stand, barber shop, factory and Netflix subscription in your country added together in one year. That total is GDP.
GDP stands for Gross Domestic Product. It is the total value of all the goods and services a country produces in a year.
A bigger GDP does not always mean people are richer. If a country has a huge population, you divide GDP by the number of people to get GDP per person. That is a better measure of how the average person lives.
GDP grows when the economy is doing well and shrinks in a recession. Fast growth like 6-8% is common for developing countries; rich countries usually grow 1-3% a year.
- Big idea: GDP measures a country’s total output.
- Big idea: GDP per person shows how rich the average person is.
- Big idea: Growth means the economy is expanding.
- Recession:
- When GDP shrinks for two three-month periods in a row.
- Nominal vs real:
- Nominal GDP counts today’s prices; real GDP strips out inflation for a fair comparison.
7. Jobs & Unemployment(3 min)
Analogy: If every adult in your school year could either have a job or be looking for one, unemployment is the share who are looking but haven’t found one yet.
The unemployment rate is the percentage of people who want a job but do not have one. A low rate (about 3-5%) is healthy; above 8% is a warning sign.
Not everyone counts. Kids in school, retirees and stay-at-home parents who are not looking for work are outside the "labour force". Only those actively looking count as unemployed.
Youth unemployment is often higher than the general rate because young people are new to the workforce and get hit hardest by economic downturns.
- Big idea: Unemployment counts people who want but lack a job.
- Big idea: A low rate is healthy; a high rate signals trouble.
- Big idea: Young people usually face higher unemployment.
- Labour force:
- People who have a job OR are actively looking for one.
- Participation rate:
- The share of working-age people in the labour force.
8. Booms & Busts: The Business Cycle(4 min)
Analogy: Economies breathe. They expand until they are stretched too thin, fall back, catch their breath, and expand again. Nobody has ever found the off switch.
The business cycle has four phases. In an expansion, companies hire, wages rise and shops are busy. At the peak, the economy is running hot: inflation climbs and firms struggle to find workers.
Then comes the recession. Spending drops, companies cut jobs, GDP shrinks. Unemployment is the slow one here — it keeps rising for months after the economy has technically stopped falling.
Recovery follows. Central banks cut interest rates and governments often spend more to speed it up. Cycles typically last several years, but no two are the same length, and nobody can reliably call the turning point in advance.
- Big idea: Economies move through expansion, peak, recession and recovery.
- Big idea: GDP and unemployment move in opposite directions.
- Big idea: Unemployment lags — it keeps rising after the bottom.
- Expansion:
- A stretch where the economy is growing and jobs are being created.
- Soft landing:
- Cooling inflation with higher rates without tipping into recession. Rare and hard.
- Lagging indicator:
- A number that reacts late, like unemployment, so it confirms rather than predicts.
9. Government Debt(4 min)
Analogy: You promise to pay your friend back £5 next week for a snack. Governments do the same — but with billions, and for decades.
Governments spend more than they collect in taxes almost every year. To cover the gap they borrow money by selling "bonds" (a fancy IOU) to investors.
The total amount owed is the national debt. We compare it to GDP to see if it is a lot: 60% of GDP is normal, above 100% is worrying, above 200% is extraordinary (Japan sits around 250%).
Debt is not automatically bad. If it pays for schools, roads and hospitals, it can help the economy grow. If it just covers day-to-day spending forever, it becomes risky.
- Big idea: Governments borrow by selling bonds.
- Big idea: Debt-to-GDP shows how heavy the debt really is.
- Big idea: Borrowing to invest is different from borrowing to survive.
- Bond:
- An IOU sold by a government or company, paid back with interest.
- Default:
- When a government cannot pay its debt back on time. Very rare for big rich countries.
10. Taxes & Government Spending(4 min)
Analogy: A country runs on a household budget, just with a lot more zeroes. Money comes in from taxes and goes out on the things everyone shares.
Most government income comes from three places: income tax on what people earn, sales taxes like VAT on what people buy, and taxes on company profits. Rich countries typically collect 30-45% of GDP in tax; many poorer countries collect under 15%.
It goes out on health, pensions, education, defense and interest on past borrowing. In most developed countries health and pensions alone eat over half the budget, and both grow as populations age.
Here is the distinction people mix up constantly. The deficit is the gap in a single year — spending minus income. The debt is every past deficit piled up. You can cut the deficit and still watch the debt grow, as long as the gap is above zero.
- Big idea: Tax comes mainly from income, spending and company profits.
- Big idea: Health and pensions dominate spending in rich countries.
- Big idea: Deficit is one year’s gap; debt is all of them added together.
- Deficit:
- How much more a government spends than it collects in a single year.
- Surplus:
- The opposite — collecting more than you spend. Uncommon.
- Progressive tax:
- A tax where higher earners pay a higher percentage, not just a bigger amount.
11. Rich vs Poor: Development & Inequality(4 min)
Analogy: If two friends share £100 and one takes £90, that’s huge inequality. Countries have the same issue on a much bigger scale.
Some countries are much richer than others. We measure development with a few numbers: GDP per person, life expectancy, and how many people have gone to school.
Inequality is about how evenly wealth is spread inside a country. Even a rich country can have big inequality if a tiny group holds most of the money.
One popular measure is the Gini coefficient (0 = perfectly equal, 100 = one person owns everything). Nordic countries score around 25; deeply unequal countries score above 50.
- Big idea: Development combines income, health and education.
- Big idea: Inequality is about how wealth is shared.
- Big idea: Two countries with the same GDP can feel very different to live in.
- HDI:
- Human Development Index — combines income, life expectancy and education into one score.
- Gini:
- A 0-to-100 number showing how unequal a country is.
Module 3: Countries Together
Trade, people moving around, and the "soft power" of culture.
12. Trade Between Countries(4 min)
Analogy: You have loads of chocolate; your friend has loads of crisps. You swap. Everyone gets both. That’s trade.
Countries trade because no country makes everything well. Japan makes great cars, Brazil grows lots of coffee, Saudi Arabia has oil. Everyone benefits by swapping.
Exports are things sold to other countries. Imports are things bought from other countries. The difference is the "trade balance".
Sometimes countries add extra fees called tariffs on imports. This makes foreign goods more expensive, protecting local businesses but making things costlier for shoppers.
- Big idea: Trade lets each country focus on what it does best.
- Big idea: Exports go out, imports come in.
- Big idea: Tariffs make imports pricier and can start trade wars.
- Tariff:
- A tax a government adds to imported goods.
- Free trade:
- When two countries agree not to add tariffs between them.
13. People on the Move: Migration(3 min)
Analogy: You might move from one town to another for a new school. Millions of people move between countries every year, for the same kinds of reasons: work, safety, family.
Migration is people moving from one country to another to live. Some come for jobs, some to study, some to escape war (they are called refugees).
Countries that welcome migrants often get younger workers, new cultures and new businesses. But it can also strain housing, schools and healthcare if not planned well.
When migrants send money back home to their families it is called a "remittance". For many countries this is a bigger money flow than any single industry.
- Big idea: People move for work, safety, family and study.
- Big idea: Migration can grow the economy but needs planning.
- Big idea: Remittances are money migrants send home — often huge.
- Refugee:
- Someone forced to leave their country because of war or persecution.
- Remittance:
- Money migrants send home to family.
14. Culture, Passports & Soft Power(3 min)
Analogy: Think about how many countries you can name from their music, movies or football teams. That influence is called soft power.
Soft power is a country’s ability to shape the world through culture, ideas and diplomacy — not through armies or money.
K-pop, Hollywood films, French cooking, Nigerian Afrobeats, British Premier League football — these all give their countries a global voice.
Passport strength is another quiet form of power. A strong passport (like Japan’s or Germany’s) lets you visit 190+ countries without a visa. A weak one may allow only 30-40.
- Big idea: Soft power comes from culture and ideas.
- Big idea: Music, film, sport and food shape how the world sees a country.
- Big idea: Passport strength quietly reflects a country’s standing.
- Soft power:
- Influence through culture and ideas, not force.
- Visa:
- Official permission to enter another country.
Module 4: Big Global Themes
Climate, energy, resources, health, defense and the AI boom.
15. The Planet’s Weather: Climate & Emissions(4 min)
Analogy: Leave a car engine running in a closed garage — the air gets thick and hot. Earth’s atmosphere works a bit like that when we release too many greenhouse gases.
Burning coal, oil and gas releases carbon dioxide (CO₂). This gas traps heat in the atmosphere — the "greenhouse effect" — and slowly warms the planet.
Some countries release far more CO₂ than others. China and the US emit the most in total; countries like Qatar and Australia emit the most per person.
The world agreed in Paris (2015) to try to keep warming below 1.5°C. That means switching to clean energy — solar, wind, nuclear, batteries.
- Big idea: CO₂ traps heat and warms the planet.
- Big idea: Big emitters differ if you measure by country or per person.
- Big idea: Clean energy is the main tool to slow warming.
- Greenhouse gas:
- Gas that traps heat in the atmosphere (mainly CO₂ and methane).
- Net zero:
- Balancing every tonne of CO₂ released with a tonne removed.
16. Powering the World: Energy & Electricity(4 min)
Analogy: Flick a light switch and something, somewhere, has to be generating that exact moment. There is no big battery holding the nation’s electricity in reserve.
Electricity comes from a mix of sources, and every country’s mix is different. France runs mostly on nuclear, Norway on hydro, Poland still largely on coal, and the UK on a blend of gas, wind and imports.
Each source trades off three things: cost, carbon, and reliability. Solar and wind are now the cheapest to build but only produce when the sun shines or the wind blows. Gas is flexible and can be turned up on demand, but it emits. Nuclear is steady and low-carbon but slow and expensive to build.
That is why no country runs on one source. A grid needs something that can fill the gap at 6pm on a still winter evening, which is the single hardest problem in the energy transition.
- Big idea: Every country has a different electricity mix.
- Big idea: Sources trade off cost, carbon and reliability.
- Big idea: Intermittent renewables need something to fill the gaps.
- Grid:
- The network of wires connecting power stations to homes and businesses.
- Intermittent:
- Only generating some of the time — solar at night produces nothing.
- Baseload:
- Steady, always-on generation like nuclear or hydro.
17. Oil, Metals & the Stuff We Use(3 min)
Analogy: Everything you use — your phone, the bus you take, the electricity in your house — needed raw materials pulled out of the ground somewhere in the world.
Some countries got lucky with natural resources: oil in Saudi Arabia, lithium in Chile, copper in Zambia, cobalt in the Democratic Republic of Congo.
These raw materials matter because modern tech needs them. Every electric car battery, every laptop, every wind turbine uses metals from a small handful of countries.
When one country controls most of a critical resource, it holds serious power. That is why "resource security" is now a topic that shows up in the news alongside AI and defense.
- Big idea: Raw materials come from a few key countries.
- Big idea: Modern tech depends on specific metals.
- Big idea: Resource control = geopolitical power.
- Critical mineral:
- A metal or element that a country decides is vital for its economy or security.
- OPEC:
- A group of big oil-producing countries that coordinate how much oil to pump.
18. Health & Wealth(4 min)
Analogy: If money bought years of life at a fixed exchange rate, the biggest spender would always live longest. It does not work that way.
Richer countries do live longer — but only up to a point. Below roughly $10,000 per person a year, extra income buys big jumps in life expectancy: clean water, vaccines, doctors. Past that, the curve flattens hard.
The United States is the clearest example. It spends far more per person on health than any other country, roughly double the rich-country average, and still has a lower life expectancy than Spain, Japan or Italy, which spend a fraction as much.
What explains the gap is not how much you spend but what you spend it on, and what happens outside the hospital: diet, smoking, road safety, inequality, and whether everyone can actually afford to see a doctor early rather than late.
- Big idea: Money buys health, but with sharply diminishing returns.
- Big idea: The US spends the most per person and does not live the longest.
- Big idea: Prevention and access matter more than total spending.
- Life expectancy:
- How long a baby born today would live on average if current conditions held.
- Universal coverage:
- A system where everyone can get healthcare without being ruined by the bill.
- Diminishing returns:
- When each extra pound spent buys less benefit than the last one did.
19. Who Spends on Defense?(3 min)
Analogy: Some countries spend a big chunk of their budget on the army — a bit like a family spending most of its money on the biggest lock in the neighbourhood.
Defense spending is the money a government spends on its military — soldiers, ships, planes, missiles.
The US spends by far the most in absolute terms (around $900bn a year). But smaller countries surrounded by threats, like Israel or Ukraine, spend a much larger share of their economy.
NATO members promise to spend at least 2% of GDP on defense. That target used to be missed by many; since the Ukraine war most now meet it.
- Big idea: Defense spending funds militaries.
- Big idea: Absolute size and % of GDP tell different stories.
- Big idea: NATO’s 2% target is a widely watched benchmark.
- NATO:
- Military alliance of 32 countries in Europe and North America.
- Arms race:
- When countries race to build more weapons than their rivals.
20. The AI Boom(3 min)
Analogy: Imagine having a super-smart study buddy that answers any question, writes essays with you and remembers everything. That’s what modern AI tools try to be.
Artificial intelligence (AI) is software that can learn patterns from huge amounts of data. Modern AI models like ChatGPT, Claude and Gemini can chat, write code and analyse images.
Training the biggest AI models is really expensive — billions of dollars and thousands of specialised chips. Only a few companies (mostly in the US and China) can afford it.
AI is already changing school, work and the economy. New laws are trying to keep it safe: the EU AI Act, US executive orders, and safety institutes in the UK and US.
- Big idea: AI learns patterns from massive data.
- Big idea: Training the biggest models costs billions.
- Big idea: Governments are writing new rules to keep AI safe.
- LLM:
- Large Language Model — an AI trained on tons of text to chat and write.
- GPU:
- A powerful chip originally made for gaming, now used to train AI.
Module 5: Think Like an Analyst
How to read a chart, spot a misleading stat, and know where numbers come from.
21. Reading a Chart Without Being Fooled(4 min)
Analogy: A chart is an argument someone is making with numbers. Most of the persuading happens before you look at a single data point — in the choices about what to show you.
The oldest trick is the truncated axis. Start the y-axis at 95 instead of 0 and a 2% wobble becomes a cliff. The numbers are completely honest; the picture is not. Always check where the bottom of the axis sits.
Second is the cherry-picked window. Pick a start date at the lowest point and everything after it looks like a boom. Pick the peak instead and the same series looks like a collapse. If a chart starts at an oddly specific year, ask what the year before looked like.
Third is totals versus per person. China emits more CO₂ than any other country and also has 1.4 billion people. Per person, Qatar emits several times more. Neither number is wrong, but they answer different questions — so notice which one you are being shown.
- Big idea: A truncated y-axis makes small changes look dramatic.
- Big idea: The start date can flip a story from boom to bust.
- Big idea: Totals and per-person figures answer different questions.
- Truncated axis:
- A chart whose axis does not start at zero, exaggerating the ups and downs.
- Cherry-picking:
- Choosing the time window that best supports the point you already wanted to make.
- Per capita:
- Per person — the total divided by the population.
22. Correlation vs Causation(4 min)
Analogy: Ice cream sales and drowning deaths rise together every summer. Ice cream does not cause drowning. Hot weather causes both.
Correlation means two things move together. It is measured with r, a number from -1 to +1. An r of +1 means they move in perfect lockstep, -1 means perfectly opposite, and 0 means no linear relationship at all.
Causation means one thing actually makes the other happen. Correlation is evidence for causation but never proof, because three other explanations exist: coincidence, reverse causation (B actually causes A), or a lurking third factor driving both — like the hot weather above.
With enough datasets you can always find a strong-looking correlation between nonsense pairs. Cheese consumption tracks bedsheet-tangling deaths at r = 0.95. The fix is to ask for a plausible mechanism before you believe the number, not after.
- Big idea: r measures how tightly two series move together, from -1 to +1.
- Big idea: A third factor can drive both without either causing the other.
- Big idea: Search enough data and strong spurious correlations are guaranteed.
- r:
- The correlation coefficient: -1 (perfect opposites) to +1 (perfect lockstep), 0 = no link.
- Confounder:
- A hidden third factor that causes both things you are comparing.
- Spurious correlation:
- Two unrelated series that happen to move together by chance.
23. Where Does Data Come From?(4 min)
Analogy: Every number on this site has a backstory: someone decided what to count, how to count it, and what to do about the bits they could not reach.
Numbers come in three flavours and they are not equal. Measured data is counted directly, like a central bank’s own interest rate. Estimated data is inferred from samples or models, like the GDP of a country with a large cash economy. Projected data is a forecast — a guess with maths attached.
Data also gets revised. A first GDP estimate is published weeks after the quarter ends and is routinely corrected by a few tenths of a percent months later. Headlines are written off the first number; the truth arrives quietly afterwards.
That is why two reputable sources can publish different figures for the same thing. The IMF, World Bank and OECD use different methods, different exchange-rate conversions and different vintages. The right response is not to pick the one you like — it is to check the definition and the date.
- Big idea: Measured, estimated and projected are three very different things.
- Big idea: Early figures get revised; the first print is rarely the final one.
- Big idea: Sources disagree because their methods and vintages differ.
- Vintage:
- Which release of a number you are looking at — first estimate, revised, or final.
- PPP:
- Purchasing power parity — adjusting for the fact that the same money buys more in some countries.
- Provenance:
- The documented trail of where a number came from and how it was produced.