Cambridge IGCSE Economics: Living standards and poverty (0455)

This guide teaches sections 5.1 (Living standards) and 5.2 (Poverty) of the Cambridge IGCSE Economics 0455 syllabus for examination in 2026. The course is not tiered, so everything here is for every candidate. Every country, firm and figure below is invented for illustration. Next, use the revision notes and the practice questions. Other links: the Cambridge IGCSE Economics hub, the printable checklist and the free diagnostics.

What this unit covers

Section	What you must be able to do
5.1.1	Explain real GDP per head and the Human Development Index (HDI), their components, and their advantages and disadvantages
5.1.2	Explain reasons for differences in living standards and income distribution within and between countries
5.2.1	Distinguish absolute from relative poverty
5.2.2	Explain causes of poverty, including unemployment, low wages, illness and age
5.2.3	Discuss policies to reduce poverty and redistribute income: growth, education, state benefits, progressive taxation, a national minimum wage

5.1.1 Real GDP per head

Gross domestic product (GDP) measures the money value of everything a country’s economy produces over a year. Its components, added together by spending, are consumption (C), investment (I), government spending (G) and exports minus imports (X - M).

Worked example: components. Country A, in an illustrative year: C = 330, I = 100, G = 90, X = 80, M = 60 (all billions). GDP = 330 + 100 + 90 + (80 - 60) = 540 billion.

Real GDP removes the effect of price rises. Divide by a price index (base year = 100) and multiply by 100.

Real GDP = 540 / 120 x 100 = 450 billion (price index 120).

Per head means divided by the population. Output can grow while living standards do not.

	Year 1	Year 2
Real GDP	420 billion	450 billion
Population	28 million	30 million
Real GDP per head	15,000	15,000

Real GDP grew by (450 / 420 - 1) = 7.14%, yet real GDP per head did not move, because the population also grew by 7.14%. A quicker rule: growth per head is about GDP growth minus population growth. Exactly, with GDP up 5% and population up 2.5%: 1.05 / 1.025 - 1 = 2.44%.

Advantages of real GDP per head: it is simple, regularly published and widely available; it allows comparison over time (real) and across countries of different sizes (per head); and income is linked to the goods and services people can buy.

Disadvantages:

• It is an average. A few very rich people raise it without helping the majority.
• It leaves out unpaid work, subsistence farming and the hidden economy.
• It says nothing about health, education, leisure, safety or freedom.
• It ignores what is produced and what damage is done (pollution, resource depletion).
• Comparing countries needs exchange rates and different price levels, which can distort the figures.

5.1.1 The Human Development Index (HDI)

The HDI is a composite index published by the United Nations Development Programme. It gives each country a value between 0 and 1; higher means more human development. It combines three dimensions:

1. Health: life expectancy at birth.
2. Education: years of schooling (average, and expected for children now).
3. Income: income per head (the UN uses gross national income per head, adjusted for price differences between countries).

You are not asked to calculate the real HDI. This simplified model shows the idea. Scale each dimension to 0-1, then take an equal-weight average. The UN’s own method differs in detail.

Life expectancy index = (actual - minimum) / (maximum - minimum), with minimum 25 and maximum 85 years.

	Country A	Country G
GDP per head	6,000	9,000
Life expectancy	72 years: (72 - 25)/60 = 0.783	60 years: (60 - 25)/60 = 0.583
Education index	0.60	0.50
Income index	0.55	0.65
Simplified average	(0.783 + 0.60 + 0.55)/3 = 0.644	(0.583 + 0.50 + 0.65)/3 = 0.578

Country G has the higher income yet the lower index. That is the point of the HDI: money income is not the whole of a good life.

Advantages of the HDI: it includes health and education as well as income; it gives one number that is easy to rank and compare; and it shows that a rich country can still have poor human development.

Disadvantages: it is still an average, so it hides inequality; it leaves out the environment, freedom, security and the quality of services; the equal weighting is a judgement; and the three components tend to move together, so it often tells a similar story to income.

Evaluation chain. Use real GDP per head for a quick measure of output and income over time. Use the HDI when judging overall well-being. Neither shows how evenly benefits are shared.

5.1.2 Differences in living standards and income distribution

Between countries, living standards differ because of:

• Resources and capital: natural resources, machinery, roads, power and technology raise output per worker.
• Human capital: education and health raise productivity and incomes.
• Institutions and stability: secure property rights, honest government and peace encourage investment; conflict and corruption deter it.
• Trade and geography: access to ports and trading partners, and dependence on a few low-value exports, change incomes.
• Population: fast growth can spread output thinly.
• Debt and policy: heavy debt payments use money that could pay for schools and clinics.

Within a country, income distribution differs because of:

• unequal ownership of wealth and land, which earns rents and profits;
• differences in education, skills and pay between jobs;
• region (cities against rural areas);
• discrimination by gender, ethnicity or disability;
• the tax and benefit system, which can narrow or widen gaps.

Worked example: quintiles. Split households into five equal groups by income. Both countries below have mean income per head of 15,000 (invented).

Quintile	Country C share	C income	Country D share	D income
Poorest 20%	4%	3,000	8%	6,000
Second	7%	5,250	12%	9,000
Third	11%	8,250	17%	12,750
Fourth	18%	13,500	23%	17,250
Richest 20%	60%	45,000	40%	30,000

Method: income = share x 5 x 15,000. For the poorest group in C: 0.04 x 5 x 15,000 = 3,000. The richest 20% earn 15 times the poorest in C (60 / 4) but 5 times in D (40 / 8). Same GDP per head, very different living standards for the poor.

5.2.1 Absolute and relative poverty

• Absolute poverty: not having enough income to buy the basic necessities of life, such as food, clean water, shelter and clothing. The line is a fixed amount of purchasing power.
• Relative poverty: having much less income than most others in the same society, for example below a set fraction (say 50%) of the median income. The line moves as the society’s income moves.

Worked example. Country E (illustrative): the cost of a basic basket is 6,000 a year (absolute line). The relative line is 50% of median income.

	Year 1	Year 2
Median income	20,000	28,000
Relative line (50%)	10,000	14,000
Household H1 income	12,000	13,000
Household H2 income	5,000	5,500

H1 rose by 8.3% yet became relatively poor: 13,000 is under 14,000. It was never in absolute poverty. H2 is in absolute poverty both years (below 6,000). Absolute poverty can fall while relative poverty rises, because medians rose 40% but H1’s income rose 8.3%.

5.2.2 Causes of poverty

Build each as a chain: cause, effect on income, effect on living standards.

• Unemployment: no wage, so income falls to benefits, if any; long spells reduce skills and make re-employment harder.
• Low wages: low-skilled or part-time jobs, weak bargaining power and low productivity leave full-time workers poor, especially with dependants.
• Illness: treatment costs money, and sickness reduces work and earnings, which can limit education and health further. This can trap a family.
• Age: retirees may have only a small pension; young children and elderly people cannot earn and depend on others.

Other causes you may add: little education, large families, discrimination, conflict, and lack of land or capital.

5.2.3 Policies to reduce poverty and redistribute income

Economic growth. More output creates jobs and raises incomes; extra tax revenue can fund services. Evaluate: growth may go mostly to the rich, and it may be slow or damage the environment. Example: if GDP rises 6% and the population 2%, income per head rises 1.06 / 1.02 - 1 = 3.92%.

Improved education. Raises skills, productivity and wages and lowers unemployment. Evaluate: costly, takes years to work, and the poorest may not attend.

More generous state benefits. Cash support for unemployed, sick, elderly and low-paid households. Evaluate: directly raises incomes quickly, but costs taxpayers, can reduce work incentives and may be hard to withdraw.

Progressive taxation. The rate rises as income rises, so the rich pay a higher proportion. Illustrative bands: 0% on income up to 10,000; 20% on the slice from 10,000 to 30,000; 40% above 30,000.

Income	Tax	Average rate	After tax
12,000	0.2 x 2,000 = 400	3.33%	11,600
25,000	0.2 x 15,000 = 3,000	12%	22,000
60,000	0.2 x 20,000 + 0.4 x 30,000 = 16,000	26.67%	44,000

The gap between the 60,000 and 12,000 earners narrows from 5 times before tax to 3.79 times after tax (44,000 / 11,600). The revenue can fund benefits and services. Evaluate: high rates may reduce effort or encourage tax avoidance.

National minimum wage. A legal minimum hourly pay. Illustrative market: at 6 an hour, demand is 1,000 workers and supply 1,000. Set at 8:

	At 6	At 8
Demand for labour	1,000	800
Supply of labour	1,000	1,200
Employed	1,000	800
Unemployed seeking work	0	400

Those who keep jobs gain (8 - 6) x 800 = 1,600; the 200 who lose jobs lose 6 x 200 = 1,200. Net pay rises by 400, but 400 want work and cannot get it. Evaluate: the effect depends on how responsive demand for labour is; a low minimum near the market wage may do little harm.

Good evaluation: compare speed (benefits fast, education slow), cost, who gains, and side effects. Conclude with a reasoned judgement for the given country.

Common errors

• Writing “GDP per head” without “real”: inflation can create false gains.
• Saying HDI measures happiness. It measures health, education and income only.
• Treating relative poverty as “less serious”. It is a different measure, not a smaller one.
• Defining progressive tax as “the rich pay more tax”. A flat-rate tax also makes the rich pay more money; progressive means a higher proportion.
• Listing policies without a chain of reasoning or a limitation.

Official syllabus

Cambridge IGCSE Economics 0455 syllabus for examination in 2026, version 2, published by Cambridge University Press & Assessment (Cambridge International Education): sections 5.1 and 5.2.