DP Economics SL 4.8 Measuring Development

DP Economics SL 4.8 Measuring Development - Full notes

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DP Economics SL | 4.8 Measuring Development

DP ECONOMICS · UNIT 4: THE GLOBAL ECONOMY

4.8

Measuring Development

Full notes for SL · IB-style

Contents

1	Why measure development?
2	Single indicators: income, health and education
3	The Human Development Index
4	Inequality-adjusted and gender measures
5	Multidimensional poverty and other composite measures
6	Strengths and limitations of development measures
7	Single indicators of development
8	GDP per capita versus GNI per capita
9	Health indicators
10	Education indicators
11	The Human Development Index
12	Interpreting HDI and GNI rankings
13	Inequality-adjusted HDI and the Gender Inequality Index
14	Multidimensional Poverty Index
15	Other composite indicators
16	Limitations of development indicators
17	Development data in practice
18	Mixed review: worked problems
19	Additional exam-style practice
20	Education index calculation
21	Development and gender
22	Development over time
23	Choosing indicators for an IA or essay
24	Common misconceptions and links
25	Exam-style question with markscheme
26	Check your understanding
27	Summary and topic map

These are full teaching notes. Read each section in order, try the Think about it question before you read on, and do every Quick check before moving to the next section.

Before you start

Rate yourself on each statement now, and again after you've worked through the notes. Shade R (not yet), A (getting there) or G (confident).

I can…	R	A	G
explain why GDP or GNI per capita at PPP is used and its limitations
explain single health, education and economic indicators
explain the components of the HDI and interpret HDI data
explain the IHDI, GII and MPI
compare countries using GNI per capita rank and HDI rank
evaluate the usefulness of different development measures

There is no additional HL content in 4.8. SL and HL students study the same material.

Guiding questions

How can we compare the development of Norway and Niger with a single number? Why might a country rank much higher on income than on human development?

How this topic is examined

4.8 is very data-heavy. Paper 2 often presents a table of GNI per capita, HDI and other indicators for several countries and asks you to compare them and explain differences in ranking.

Strong answers explain what each indicator measures, why rankings differ (for example, oil wealth with poor education), and the limitations of composite indices.

Command term	What the examiner wants
Define	the precise meaning, ideally in the IB wording, in one or two sentences
Draw / Sketch	a fully labelled diagram with every axis, curve, equilibrium and change labelled
Explain	a causal chain linked to economic theory, usually supported by a diagram
Analyse	break a situation into its parts and trace the effects of each
Evaluate / Discuss	weigh up arguments, question assumptions and reach a justified conclusion using real-world examples
Calculate	calculate differences in rank, ratios or percentage changes step by step

How to use these notes

Each section teaches one part of the syllabus in full. You'll see these boxes throughout; each has one job:

Box	What it's for
Think about it	a question to get you thinking before a section; the answer comes in the section
Key point	the one idea you must not forget
Common mistake	an error examiners see every year, and how to avoid it
In the real world	where the economics shows up outside the classroom
Try this	something quick you can do yourself to test the idea
Worked example	full solutions with IB-style marks (M1 method, A1 answer, R1 reasoning)
Quick check	short questions to test yourself at the end of each section

1 Why measure development?

To compare, to track progress, and to target help.

Think about it

If you had to rank five countries by 'development', what three pieces of information would you ask for first?

Governments, international organizations and aid agencies need to measure development to compare countries, track progress over time, identify problems and target resources. Because development is multidimensional (4.7), no single number captures it fully. Economists use single indicators that measure one dimension, and composite indicators that combine several.

2 Single indicators: income, health and education

Each indicator captures one dimension.

2.1 Income indicators

GDP per capita and GNI per capita measure average income. GNI is often preferred for development comparisons because it measures the income residents actually receive, including income from abroad (remittances can be large in some developing countries) and excluding profits sent abroad by foreign firms.

To compare countries, these are converted at purchasing power parity (PPP), which adjusts for differences in the cost of living (3.1). Without PPP, poor countries' incomes are understated, because local prices for non-traded goods and services are much lower.

Limitations: averages hide inequality; the informal economy is undercounted; and income ignores health, education and the environment.

2.2 Health indicators

Life expectancy at birth: the average number of years a newborn is expected to live. Infant mortality rate: deaths of infants under one year per 1 000 live births. Maternal mortality ratio: deaths of mothers from pregnancy-related causes per 100 000 live births. These reflect access to health care, nutrition, clean water and sanitation.

2.3 Education indicators

Mean years of schooling (average years of education received by adults aged 25 and over), expected years of schooling (years a child entering school can expect to receive), literacy rates and enrolment rates at primary and secondary level.

2.4 Other single indicators

Access to clean water and sanitation, electricity, internet; the share of the workforce in agriculture (high in less developed economies); and energy use per capita.

Dimension	Indicator	What it shows
Income	GNI per capita (PPP)	average purchasing power
Health	life expectancy; infant and maternal mortality	health care, nutrition, sanitation
Education	mean and expected years of schooling; literacy	human capital
Living standards	access to water, sanitation, electricity	basic infrastructure

Quick check

1. Why is GNI per capita at PPP preferred for comparisons?

2. Name two health indicators.

Answers: 1. includes income from abroad and adjusts for cost of living 2. life expectancy, infant mortality

3 The Human Development Index

Three dimensions combined into one number.

The Human Development Index (HDI), published by the United Nations Development Programme (UNDP) since 1990, combines three dimensions of development: a long and healthy life (measured by life expectancy at birth); knowledge (measured by mean years of schooling and expected years of schooling); and a decent standard of living (measured by GNI per capita at PPP, using a logarithm so that extra income matters less at high levels).

Each dimension is turned into an index between 0 and 1, and the HDI is their geometric mean. The HDI ranges from 0 to 1. Countries are grouped as very high (0.800 and above), high (0.700 to 0.799), medium (0.550 to 0.699) and low (below 0.550) human development.

Country	HDI (approx.)	Life expectancy	Expected years of schooling	GNI per capita PPP ($)
Norway	0.966	83	18.6	69 000
India	0.644	68	12.6	6 950
Niger	0.394	62	7.0	1 240

3.1 Comparing GNI rank and HDI rank

A useful comparison is GNI per capita rank minus HDI rank. A positive value means the country ranks higher on human development than on income: it converts income into health and education effectively. A negative value means it ranks lower on HDI than on income: income is not being translated into human development, perhaps because of inequality, poor public services or dependence on resource exports.

WORKED EXAMPLE 1 Rank comparison

Country X ranks 45th in GNI per capita and 70th in HDI. Country Y ranks 90th in GNI per capita and 72nd in HDI. Calculate GNI rank minus HDI rank and interpret.

Solution

X: 45 − 70 = −25: lower human development than income would suggestA1 R1

Y: 90 − 72 = +18: converts modest income into relatively good health and educationA1 R1

Oil-rich economies often have strongly negative values; countries such as Cuba, Sri Lanka and Georgia have had positive ones.

Quick check

1. Name the three dimensions of the HDI.

2. What does a positive GNI rank minus HDI rank mean?

Answers: 1. health, education, standard of living 2. better human development than income alone would predict

4 Inequality-adjusted and gender measures

Averages can hide who is left behind.

The Inequality-adjusted HDI (IHDI) adjusts the HDI for inequality in each dimension. If health, education and income are equally distributed, the IHDI equals the HDI; the more unequal the distribution, the larger the gap. The loss from HDI to IHDI shows how much human development is lost to inequality.

The Gender Inequality Index (GII) measures inequality between women and men in reproductive health (maternal mortality, adolescent birth rate), empowerment (share of parliamentary seats, secondary education) and the labour market (labour force participation). It ranges from 0 (equality) to 1; a higher value means greater gender inequality.

WORKED EXAMPLE 2 Loss due to inequality

A country's HDI is 0.750 and its IHDI is 0.600. Calculate the percentage loss due to inequality.

Solution

Loss = (0.750 − 0.600) ÷ 0.750 × 100M1

= 20%A1

Quick check

1. What does the IHDI adjust for?

2. What does a GII of 0.5 compared with 0.1 indicate?

Answers: 1. inequality in health, education and income 2. greater gender inequality

5 Multidimensional poverty and other composite measures

Measure deprivation directly, or include well-being and sustainability.

The Multidimensional Poverty Index (MPI) measures poverty directly through ten indicators in three dimensions: health (nutrition, child mortality), education (years of schooling, school attendance) and living standards (cooking fuel, sanitation, drinking water, electricity, housing, assets). A person is multidimensionally poor if deprived in at least a third of the weighted indicators. The MPI reports both how many people are poor and how intensely.

Other measures include the Happy Planet Index (well-being and life expectancy relative to ecological footprint), the OECD Better Life Index, and measures of sustainability, such as adjusted net savings, which subtract natural resource depletion and pollution damage from national savings.

Measure	What it captures	Key limitation
GNI per capita (PPP)	average income	ignores distribution and non-income dimensions
HDI	health, education, income	ignores inequality, environment, freedom
IHDI	HDI adjusted for inequality	data demands
GII	gender inequality	limited indicators
MPI	direct deprivations	weights are a judgement; data gaps
Happy Planet Index	well-being with sustainability	subjective data

6 Strengths and limitations of development measures

Use several measures together.

Strengths. Composite indices such as the HDI capture several dimensions in one number, are easy to communicate, allow comparisons across countries and time, and draw attention away from income alone.

Limitations. Every index involves choices about which indicators to include and how to weight them, which are value judgements. Data in low-income countries may be incomplete or out of date. Averages hide inequality within countries (regions, ethnic groups, gender). The HDI ignores political freedom, human rights, environmental sustainability and security. Small changes in index values may not be meaningful.

The best approach is to use a range of indicators together, single and composite, and to look at trends over time as well as levels.

Key point

No single measure captures development. Compare GNI and HDI ranks, adjust for inequality, and use the MPI to see who is deprived and how.

7 Single indicators of development

One measure at a time.

Single indicators include GDP and GNI per capita (at PPP), life expectancy, infant and maternal mortality, literacy rates, mean years of schooling, and access to clean water and electricity. Each captures one aspect of development.

Indicator	What it shows
GNI per capita (PPP)	average income and purchasing power
life expectancy	health conditions
infant mortality per 1000	health care, nutrition, sanitation
mean years of schooling	education of adults
access to electricity	infrastructure

8 GDP per capita versus GNI per capita

Which is better?

GNI per capita includes net income from abroad, so it better reflects resources available to residents, particularly where foreign-owned firms repatriate profits or where remittances are large.

WORKED EXAMPLE 3 Choosing (standard)

Why might GNI per capita be lower than GDP per capita in a country with many foreign-owned mines?

Solution

Profits are sent abroad to foreign ownersR1

Net factor income is negativeR1

9 Health indicators

Life and death statistics.

Infant mortality (deaths under 1 year per 1000 live births) and maternal mortality reflect access to healthcare, nutrition and sanitation. They change faster than life expectancy and are sensitive indicators of development.

WORKED EXAMPLE 4 Calculation (standard)

A country records 2400 infant deaths among 150 000 live births. Calculate the infant mortality rate.

Solution

2400/150 000 × 1000M1

= 16 per 1000A1

10 Education indicators

Human capital.

Education indicators include adult literacy, primary and secondary enrolment rates, mean years of schooling (adults) and expected years of schooling (children). Quality also matters: learning outcomes vary greatly.

Quick check

1. Why might enrolment rates overstate educational progress?

Answers: 1. enrolment does not guarantee attendance or learning quality

11 The Human Development Index

A composite measure.

The HDI combines three dimensions: a long and healthy life (life expectancy), knowledge (mean and expected years of schooling) and a decent standard of living (GNI per capita at PPP). It ranges from 0 to 1.

WORKED EXAMPLE 5 Health index (exam level)

Life expectancy is 70 years; minimum 20, maximum 85. Calculate the health index.

Solution

(70 − 20)/(85 − 20) = 50/65M1

= 0.769A1

Quick check

1. Why is the HDI a geometric mean of the three indices?

Answers: 1. poor performance in one dimension is not fully offset by another

12 Interpreting HDI and GNI rankings

Comparing ranks.

If a country's HDI rank is much better than its GNI per capita rank, it converts income into human development effectively (strong health and education). If worse, income is not translating into well-being (inequality, poor services).

WORKED EXAMPLE 6 Rank difference (exam level)

Country A ranks 60th for GNI per capita but 40th for HDI. Interpret.

Solution

Better HDI than income suggestsR1

Effective investment in health and educationR1

13 Inequality-adjusted HDI and the Gender Inequality Index

Adjusting for distribution.

The IHDI adjusts the HDI for inequality in each dimension; the larger the gap between HDI and IHDI, the greater the inequality. The Gender Inequality Index measures disparities in reproductive health, empowerment and labour market participation.

Quick check

1. What does a large gap between HDI and IHDI indicate?

Answers: 1. high inequality in health, education or income

14 Multidimensional Poverty Index

Overlapping deprivations.

The MPI identifies people deprived in at least a third of weighted indicators across health (nutrition, child mortality), education (years of schooling, attendance) and living standards (electricity, water, sanitation, housing, cooking fuel, assets).

Quick check

1. Why can the MPI reveal poverty that income measures miss?

Answers: 1. it captures deprivations in services and living conditions

15 Other composite indicators

Happiness and well-being.

The Happy Planet Index combines well-being, life expectancy and ecological footprint; the World Happiness Report uses survey-based life satisfaction; the Social Progress Index measures basic needs, foundations of well-being and opportunity without income.

Quick check

1. Why might some countries score highly on the Happy Planet Index but low on GDP?

Answers: 1. good well-being and life expectancy with small ecological footprint

16 Limitations of development indicators

Data and meaning.

Problems include data quality and availability, the informal economy, averages hiding inequality, difficulty comparing across cultures, and the subjectivity of weighting in composite indices.

WORKED EXAMPLE 7 Limitations (exam level)

Explain two limitations of the HDI.

Solution

Averages hide inequality within countriesR1

Excludes environment, political freedom and securityR1

17 Development data in practice

Comparing countries.

Country	GNI per capita PPP ($)	Life expectancy	Mean years schooling
Norway	about 66 000	83	13
Costa Rica	about 21 000	77	9
India	about 7 000	67	6.5
Niger	about 1 300	62	1.4

WORKED EXAMPLE 8 Interpreting (standard)

Using the table, compare Costa Rica and India.

Solution

Costa Rica: higher income, life expectancy and schoolingR1

Large gaps in health and education outcomesR1

18 Mixed review: worked problems

Bringing the ideas together.

WORKED EXAMPLE 9 Mixed problem (exam level)

Explain why composite indicators may give a better picture of development than single indicators.

Solution

Development is multidimensionalR1

Combining income, health and education captures more aspectsR1

19 Additional exam-style practice

Paper 1 and Paper 2.

WORKED EXAMPLE 10 Paper 1 part (b) (exam level)

Evaluate the HDI as a measure of economic development. [15]

Solution

Explain the three dimensions and calculationR1 R1

Strengths compared with GDP per capitaR1

Limitations and alternatives; judgementR1 R1

20 Education index calculation

Combining schooling measures.

The education index averages the mean years of schooling index (max 15) and expected years of schooling index (max 18).

WORKED EXAMPLE 11 Education index (exam level)

Mean years = 9; expected years = 14. Calculate the education index.

Solution

MYS index = 9/15 = 0.60; EYS index = 14/18 = 0.778M1

Average = 0.689A1

21 Development and gender

Women and growth.

Gender equality in education and employment is linked to faster development: educated women tend to have fewer, healthier children and higher earnings, raising household and national incomes.

Quick check

1. Give one way educating girls supports development.

Answers: 1. improves child health and household incomes

22 Development over time

Tracking progress.

Global indicators have improved greatly since 1990: extreme poverty fell from about 38% to under 10% of the world population, and life expectancy rose. Progress has been uneven, and setbacks occurred during COVID-19.

Quick check

1. Why did some development indicators worsen in 2020–2021?

Answers: 1. COVID-19 reduced incomes, disrupted education and healthcare

23 Choosing indicators for an IA or essay

Practical advice.

Use several indicators covering income, health and education; give recent data with sources and years; compare with similar countries; and comment on limitations.

Quick check

1. Why should data sources and years be stated?

Answers: 1. indicators change over time and sources differ

24 Common misconceptions and links

Students often think…	Actually…
a high HDI means no poverty	averages can hide large deprived groups
GNI and HDI rankings should match	differences reveal how well income is converted into human development
the MPI measures income poverty	it measures deprivations directly

How 4.8 connects to the rest of the course

Topic	Connection
3.1 Limitations of GDP	why income is not enough
3.4 Inequality and poverty	Lorenz curves, Gini, MPI
4.7 Sustainable development	development beyond growth
4.9 Barriers to development	why indicators differ

25 Exam-style question with markscheme

Try this under exam conditions (about 15 minutes) before reading the markscheme.

Figure 1. HDI values for three countries.

Text A. Country A is an oil exporter with GNI per capita of $45 000 but ranks 15 places lower on HDI than on GNI. Country B has GNI per capita of $12 000 and ranks 12 places higher on HDI than on GNI, thanks to free public education and health care.

(a) Identify the three dimensions of the HDI. [2]

(b) Explain why Country A ranks lower on HDI than on GNI per capita. [3]

(d) Explain two limitations of the HDI. [4]

Markscheme

Part	Answer	Marks
(a)	health, education, standard of living	A2
(b)	oil income concentrated / inequality	R1
	less invested in health and education	R1
	income not converted into human development	R1
(c)	free public education raises schooling	R1
	public health care raises life expectancy	R1
	good conversion of income into capabilities	R1
(d)	ignores inequality (use IHDI)	R1 A1
	ignores environment / freedom / data quality	R1 A1

Examiner's comments. In (b) and (c), the best answers linked the ranking difference to how income is distributed and spent.

26 Check your understanding

Section A: multiple choice

1. The HDI combines

A. health, education and income B. income, inflation and unemployment C. GDP and exports D. health and income only

2. A country with a positive GNI rank minus HDI rank

A. has a high GDP B. is poor C. converts income into human development effectively D. has high inequality

3. The IHDI adjusts the HDI for

A. inflation B. inequality C. population D. the environment

4. The MPI measures

A. average income B. GDP growth C. gender inequality only D. deprivations in health, education and living standards

5. GNI per capita at PPP adjusts for

A. inflation over time B. differences in the cost of living C. inequality D. population growth

6. Which is a health indicator?

A. infant mortality rate B. literacy rate C. GNI per capita D. mean years of schooling

7. A higher GII means

A. less gender inequality B. higher income C. more education D. greater gender inequality

8. A limitation of the HDI is that it

A. includes too many indicators B. uses PPP C. ignores environmental sustainability D. measures health

Section B: structured

9. Explain why GNI per capita is an imperfect measure of development. [4]

10. Explain how the HDI is constructed. [4]

11. Evaluate the HDI as a measure of development. [8]

Answers

1. A 2. C 3. B 4. D 5. B 6. A 7. D 8. C

9. Averages hide inequality; informal economy; ignores health, education, environment.

10. Life expectancy; mean and expected years of schooling; GNI per capita PPP; indices 0 to 1 combined.

11. Strengths: multidimensional, comparable; limitations: inequality, environment, freedom, data, weights; alternatives; judgement.

27 Summary and topic map

Idea	Remember
Single indicators	GNI per capita PPP, life expectancy, schooling, access to services
HDI	health, education, income; 0 to 1
GNI rank − HDI rank	positive: good conversion; negative: poor
IHDI	HDI adjusted for inequality
GII	gender inequality
MPI	10 indicators of deprivation
Limitations	weights, data, averages, missing dimensions

Before the exam, make sure you…

•state what each indicator measures
•explain rank differences using inequality and public services
•use the IHDI and MPI to show hidden deprivation
•evaluate with weights, data and missing dimensions

Measuring Development on one page

Cover this page with a sheet of paper and try to rebuild it from memory. Whatever you can't recall is what to revise next.

Figure 2. Topic map for Measuring Development.

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