Economic development

• The chapter's one habit: measure carefully, ask what the indicator leaves out, then trace the feedback. A complete Topic 5 answer does all three; a weak one stops after the first.
• Three sessions, 95 minutes in total, spread over a month. That is less time than rereading the chapter twice, and retrieval spaced this way holds material considerably longer than rereading does.

• I can define real GDP per head, calculate it, and explain how it can fall in a year when real GDP rises.
• I can name the three dimensions of the Human Development Index and the indicator used for each, and state that it runs from 0 to 1.
• I can give three advantages and three disadvantages of real GDP per head and of the HDI as indicators of living standards.
• I can explain why incomes and living standards differ within a country and between countries.
• I can define absolute and relative poverty precisely enough that the two definitions cannot be confused.
• I can explain all five causes of poverty — unemployment, low wages, illness, age and environmental factors — and show how they reinforce each other.
• I can explain all six policies to alleviate poverty and redistribute income, each with one limitation.
• I can define birth rate, death rate, natural increase, immigration, emigration and net migration in the correct units.
• I can calculate a population change from a birth rate, a death rate and migration figures, and express it as a percentage.
• I can define the optimum population and use it to define under-population and over-population.
• I can analyse the effects of a rise or a fall in population size, of an ageing population, of a younger population and of a change in gender distribution.
• I can calculate and interpret a dependency ratio.
• I can explain all eight causes and consequences of international differences in development, and describe the poverty cycle and one way of breaking it.

Why this topic rewards precision. Topic 5 leans harder on arithmetic than most of the syllabus: per-head figures, birth and death rates and age-structure ratios all come from two-line calculations, and a calculation is either right or wrong regardless of how well you write. The same topic then asks the opposite skill — saying what a number leaves out. Getting both halves is what the chapter is for.

• "GDP went up, so living standards went up." Fix Living standards use real GDP per head. If the population grew faster than output, the average fell. And even a rising per-head figure is an average that says nothing about distribution, health, education, leisure, working conditions or the environment.
• "The HDI is a measure of income." Fix Income is one of its three dimensions. The other two are a long and healthy life and knowledge. Listing only income reproduces one third of the definition and calls it the whole.
• "Absolute poverty means being poor compared with other people." Fix That is relative poverty. Absolute poverty is being unable to afford the basic necessities of life, measured against a fixed line. Swap the two and every sentence that follows is about the wrong concept.
• "The birth rate is the number of babies born." Fix It is births per 1,000 of the population per year. Without the units the definition is incomplete, and the calculation cannot be attempted at all.
• "The optimum population is the biggest population the country can feed." Fix It is the population size that maximises real GDP per head given the existing land, capital and technology. It is an economic optimum, not a survival limit, and it moves when capital or technology changes.
• "Developing countries are poor because they have no natural resources." Fix Plenty of resource-rich countries remain poor and plenty of resource-poor countries are rich. What decides the outcome is productivity, saving and investment, education, healthcare and how any resource revenue is used. Name the specific difference; do not reach for resources by reflex.
• "A bigger GDP means higher living standards." Correction Living standards use real GDP per head, and even that is an average that ignores the distribution of income and every non-monetary aspect of welfare. A country can have the larger economy and the lower standard of living at the same time — which is exactly what Worked model 1 shows.
• "The HDI measures income." Correction It combines three dimensions: life expectancy at birth; mean years of schooling of adults together with expected years of schooling of children; and GNI per head adjusted for purchasing power. Income is one third of it.
• "The HDI is measured out of 100." Correction It runs from 0 to 1. A value written as "72" instead of "0.72" is not the HDI.
• "Absolute poverty is poverty compared with other people." Correction That is relative poverty. Absolute poverty is an income insufficient to afford the basic necessities of life, measured against a fixed international poverty line.
• "Relative poverty disappears once a country becomes rich." Correction It falls only if the income distribution narrows, because the line it is measured against is a percentage of median income and rises with the economy. Relative poverty exists in every country, including the richest.
• "The birth rate is the number of babies born." Correction It is live births per 1,000 of the population per year. The same applies to the death rate. Without the units the definition is incomplete and the calculation cannot be attempted.
• "Net migration means immigration." Correction Net migration is immigration minus emigration, and it can be negative. A country can have substantial immigration and still be losing population to migration overall.
• "The optimum population is the largest population a country can support." Correction It is the size that maximises real GDP per head given the existing land, capital and technology. It is a maximum of output per person, not a survival ceiling, and it moves upwards whenever the capital stock or technology improves.
• "An ageing population only affects pensions." Correction It also raises healthcare spending, shrinks the labour force, raises the dependency ratio, shifts the pattern of demand towards healthcare and leisure, and forces a choice between higher taxes, more borrowing, a higher retirement age and more immigration.
• "Developing countries are poor because they lack natural resources." Correction Many resource-rich countries are poor and many resource-poor countries are rich. Productivity, saving and investment, education, healthcare and the quality of institutions explain far more of the gap, and what matters about resource revenue is whether it is invested or consumed.
• "A high dependency ratio is always a problem." Correction It depends entirely on the composition. A ratio driven by children is a temporary cost that returns as a larger labour force; a ratio driven by the elderly is a permanent and rising cost. Two countries with the identical ratio can face opposite problems, which is the point of Figure 5.3.

• Command words. Only nine are used in this syllabus: analyse, calculate, define, describe, discuss, explain, give, identify, state. "Discuss" is the one that carries the AO3 marks, and it is the only one that requires you to reach a judgement. Every practice question in this chapter uses one of the nine.
• Defining the HDI completely. "A measure of development" is not enough. Say composite, name the three dimensions, and give the indicator for each. That is the full definition and it takes one sentence: "The HDI is a composite index of development combining life expectancy at birth, mean and expected years of schooling, and GNI per head adjusted for purchasing power, into a value between 0 and 1."
• Two-sided by construction. Every row of this matrix has a "main risk" column. In a "discuss" question that column is your counter-argument, and the "attacks which poverty" column is your judgement condition. If you can reproduce one row from memory, you can write a full two-sided answer on that policy.
• Two habits that protect a calculation. First, write the working out in full even when you can do it mentally: visible working shows the method you used, whereas a bare wrong number shows nothing at all. Second, put the unit on the answer — "+168,000 people, a rise of 1.4%" rather than "168,000". Topic 5 mixes people, money, rates per 1,000, percentages and index values, and an unlabelled figure is indistinguishable from a guess.
• Answering "explain two reasons why Country A is more developed than Country B". Pick two rows from the matrix, and for each one give the cause, the mechanism and the consequence. The command word is "explain", which the syllabus defines as "set out purposes or reasons / make the relationships between things clear / say why and/or how and support with relevant evidence" — so a bare list of six labels has not answered it, while two reasons with their mechanisms has. The published assessment objective weightings point the same way: AO2 Analysis 47% against AO1 Knowledge and understanding 43%.
• Check your arithmetic by a second route. Each worked example above contains a tick mark where the answer was verified a different way: the components summing back to the total, the split summing back to the ratio. It costs ten seconds and it catches almost every slip. In Worked example 3, if your two split figures had not summed to your ratio, you would have known immediately that something was wrong.
• Timing. Paper 2 gives 80 marks in 2 hours, so the whole paper runs at about a minute and a half per mark. Each Section B question is 20 marks, which is roughly 30 minutes, and on the conventional split part (d) is 8 of those — about 12 minutes. That is two developed paragraphs and a judgement, not an essay. Both model answers above are written at roughly that length; note how much of their strength comes from the condition in the final paragraph rather than from extra content.

• Every candidate takes both papers. There is no tiered entry in this syllabus and no separate paper for any group of candidates: the same two papers are sat by everyone, both are based on all of the subject content, and every candidate is eligible for grades A* to G. Calculators may be used in both.
• Across the whole qualification the weights are AO1 43%, AO2 47%, AO3 10%. Analysis is the largest single component, which is why every explanation in this chapter is written as a chain rather than a list.
• Calculate. Real GDP per head, percentage change, births and deaths from a rate per 1,000, net migration, population change. All of them are short, and a calculation is right or wrong independently of how well you write. The dependency ratio is added to that list in this chapter because it is the standard way of expressing an age structure, which 5.3.2 does require — see the note in section H.
• Compare an indicator with what it leaves out. Be ready for the shape "real GDP per head rose — explain why living standards may not have improved". Have at least three distinct reasons prepared, not one repeated three ways.
• Chain a population change to a government's finances. Ageing → a higher dependency ratio → more pension and healthcare spending per worker → higher taxes or borrowing. Three links, then a condition.
• Judge a policy two-sidedly. Every one of the six poverty policies has a limitation printed beside it in this chapter. A "discuss" question asks for both sides and a judgement, so the limitation is half the answer, not an optional extra.