IB MYP Individuals and Societies – Economic Agents, Measurements and Trends Revision Notes

These are condensed notes for the final weeks. For full explanations and worked examples, read the economic agents, measurements and trends study guide first.

The notes are for IB MYP Individuals and Societies and follow the International Baccalaureate Organization, Middle Years Programme Subject Brief – Individuals and societies, from 2014. They cover two topics the brief lists for the individuals and societies on-screen examinations – economic agents (consumers, producers, governments, banks) and measurements and trends – and suit MYP years 4 and 5. There is no SL/HL split in MYP. MYP has no prescribed content list – schools design their own units – so check the depth of your own unit with your teacher, who will share the task-specific clarifications.

Course links: MYP Individuals and Societies hub · printable checklist · practice questions for this unit · how MYP Individuals and Societies is assessed · criteria in practice revision notes · source-evaluation exam preparation.

Where this sits in the course

• The brief lists “economic agents and their interests and role in the economy” and “measurements and trends” among the on-screen examination topics.
• On-screen tasks: Investigating 26 marks (A and B), Communicating 18 marks (A and C), Thinking critically 36 marks (A, C and D).
• Concepts from the brief that fit: key concepts systems and change; related concept examples globalization and sustainability.
• Global context that fits best: fairness and development (who gains from growth; how to measure well-being).

Economic agents in one table

Agent	Does	Wants
Households / consumers	Buy goods and services; supply labour; save	Most satisfaction from limited income
Firms / producers	Use land, labour, capital and enterprise to produce; employ; invest	Profit, growth, survival
Government	Taxes, spends on public services, pays benefits, regulates	Citizens’ well-being, stable prices, jobs, growth (and re-election)
Banks	Take deposits, lend, handle payments	Profit from the gap between interest charged and interest paid
Central bank	Bank of the government and of banks; usually sets the main interest rate	Stable prices and a stable financial system

Factor incomes: land → rent; labour → wages; capital → interest; enterprise → profit.

Circular flow: households → factors → firms; firms → incomes → households; households → spending → firms.

Leakages (money out)	Injections (money in)
Saving	Investment
Taxes	Government spending
Imports	Exports

Memory aid: each leakage pairs with the injection on its row (saving–investment through banks; taxes–government spending; imports–exports).

Formulas

Measure	Formula	Unit
GDP (expenditure)	C + I + G + (X − M)	currency
GDP per capita	GDP ÷ population	currency per person
Real GDP	nominal GDP ÷ price index × 100	base-year prices
Growth rate	(new − old) ÷ old × 100	%
Weighted price change	Σ(weight × % change) ÷ Σ weights	%
Inflation rate	(CPI now − CPI before) ÷ CPI before × 100	%
Labour force	employed + unemployed	people
Unemployment rate	unemployed ÷ labour force × 100	%
HDI	cube root of (health index × education index × income index)	0 to 1
Dimension index	(actual − minimum) ÷ (maximum − minimum)	0 to 1

HDI goalposts (UNDP): life expectancy 20–85 years; expected schooling 0–18 years; mean schooling 0–15 years; GNI per capita (PPP) 100–75,000, using natural logarithms. Education index = average of the two schooling indices. Groups: very high 0.800+, high 0.700–0.799, medium 0.550–0.699, low below 0.550.

Definitions to learn word for word

• GDP – the total value of final goods and services produced within a country in a year.
• Economic growth – an increase in real GDP.
• Inflation – a sustained rise in the general price level.
• Deflation – a sustained fall in the general price level.
• Disinflation – a fall in the rate of inflation; prices still rise, more slowly.
• Unemployed – of working age, without a job, available for work and actively seeking it.
• Economically inactive – neither employed nor unemployed (students, retired people, full-time carers).
• HDI – a UNDP index, first published in 1990, combining health, education and income.
• PPP (purchasing power parity) – an adjustment so that money is compared by what it buys in each country.

Method in steps

Calculating GDP and GDP per capita

1. Write the formula: C + I + G + (X − M).
2. Put brackets round (X − M) and keep its sign.
3. Check units (billions? millions?) before dividing by population.
4. Give the answer with units: “30,000 crowns per person”.

Nominal to real

1. Divide nominal GDP by the price index and multiply by 100.
2. Work out the growth rate from the real figures, not the nominal ones.

Weighted inflation

1. Multiply each weight by its price change (keep negative signs).
2. Add the products; divide by the sum of the weights.
3. New index = old index × (1 + rate ÷ 100).

Describing a trend (TRAL)

1. Trend – overall direction, with first and last figures and years.
2. Rate – when the change was fastest or slowest.
3. Anomalies – peaks, dips, reversals, with years.
4. Links – between two variables, worded “is consistent with”, never “proves”.

Small reminder: CPI 140 → 147 is inflation of 7 ÷ 140 × 100 = 5%.

Types of unemployment

Type	Cause	Quick example
Frictional	Between jobs	A nurse moving to a new hospital
Seasonal	Seasonal demand	A ski instructor in summer
Structural	Decline of an industry; skills mismatch	Shipyard workers after a yard closes
Cyclical	Low spending in a recession	Car-factory workers laid off as sales fall

Must-know distinctions

• Nominal vs real: nominal uses current prices; real removes inflation.
• GDP vs GDP per capita: total output vs output per person. A large country can have high GDP and low GDP per capita.
• GDP vs GNI: GDP is produced within the country; GNI adds income residents earn from abroad and subtracts income sent abroad. The HDI uses GNI per capita.
• Inflation falling vs prices falling: 6% → 3% inflation is disinflation; prices are still rising.
• Percent vs percentage points: a rate going from 4% to 5% rises by 1 percentage point, which is a 25% rise.
• Unemployed vs inactive: a full-time student is not unemployed.
• Arithmetic vs geometric mean: the HDI multiplies the three indices and takes the cube root, so one very low index pulls the HDI down strongly.
• Correlation vs causation: two series moving together do not prove one causes the other.

Evaluating the measures

Measure	Strength	Limitation
GDP per capita	Widely collected; easy to compare over time	Hides inequality, unpaid work, informal economy, environmental damage
CPI inflation	Based on a real household basket	Basket and weights may not match your household; quality changes are hard to measure
Unemployment rate	Clear international definition	Misses people who stop looking and underemployment
HDI	Adds health and education to income	Ignores inequality, freedom and the environment; averages hide differences within a country

Quick self-test

1. C = 300, I = 80, G = 120, X = 90, M = 110 (billions). Calculate GDP.
2. GDP is 480 billion and the population is 12 million. Calculate GDP per capita.
3. Nominal GDP is 550 billion and the price index is 110. Calculate real GDP.
4. The CPI rises from 140 to 147. Calculate the inflation rate.
5. 11.4 million people are employed and 0.6 million unemployed. Calculate the unemployment rate.
6. The unemployment rate rises from 4% to 5%. State the change in percentage points and in percent.
7. Dimension indices are health 0.9, education 0.6, income 0.8. Calculate the HDI to 3 d.p.
8. Inflation falls from 5% to 2%. Is this deflation or disinflation?
9. Money wages rise 4% and inflation is 6%. What happens to real wages, roughly?
10. Classify: (a) a ski instructor out of work in summer; (b) coal miners after a pit closes.
11. Which agent usually sets a country’s main interest rate?
12. Is each an injection or a leakage: (a) exports; (b) saving?

Answers

1. 300 + 80 + 120 + (90 − 110) = 480 billion.
2. 480,000,000,000 ÷ 12,000,000 = 40,000 per person.
3. 550 ÷ 110 × 100 = 500 billion (base-year prices).
4. 7 ÷ 140 × 100 = 5%.
5. Labour force 12.0 million; 0.6 ÷ 12.0 × 100 = 5.0%.
6. +1 percentage point; (5 − 4) ÷ 4 × 100 = 25% rise.
7. (0.9 × 0.6 × 0.8)^(1/3) = 0.432^(1/3) = 0.756 (high).
8. Disinflation – prices still rise, more slowly.
9. They fall by about 2% (exactly 1.04 ÷ 1.06 − 1 ≈ −1.9%).
10. (a) Seasonal; (b) structural.
11. The central bank.
12. (a) Injection; (b) leakage.

Where marks are usually lost

• Adding imports in the GDP formula instead of subtracting them.
• Losing the minus sign on net exports or on a falling price.
• Calculating growth from nominal figures when the question asks for real growth.
• Using a simple average of price changes when weights are given.
• Dividing by the working-age population, not the labour force, for the unemployment rate.
• Writing “1%” when the answer is “1 percentage point”.
• Saying prices fell when only the inflation rate fell.
• Using the arithmetic mean for the HDI, or forgetting the education index averages two indicators.
• Describing a trend with no years, no figures or no units.
• Claiming one variable caused another because they move together.

Official syllabus

These notes are aligned to the International Baccalaureate Organization, Middle Years Programme Subject Brief – Individuals and societies, from 2014. The brief lists “economic agents and their interests and role in the economy: consumers, producers, governments, banks” and “measurements and trends” among the topics explored in the individuals and societies on-screen examinations. The full MYP individuals and societies guide is available to schools through the IB.