Chapter Summary

• Migration = moving across an official boundary intending to live there permanently (UN: 1+ year)
• Migration can be voluntary (free choice) or involuntary/forced (no choice)
• Movement is also either internal (within a country) or international (between countries)
• Push factors drive people away from origin; pull factors attract them to a destination
• Personal, national, and legal barriers can stop or slow migration
• 281 million people are international migrants (2020) — about 3.6% of the world's population
• Rural-to-urban migration dominates in developing countries; counter-urbanisation (urban-to-rural) dominates in developed ones
• Migration creates winners and losers at the origin, destination, and for the migrant themselves
• Remittances are one of the most powerful positive impacts on developing countries
• Case study: Mexico → USA is the classic example of international labour migration

1. What Actually Is "Migration"?

Before anything else, get this definition rock solid, because exam questions love to test whether you actually understand it rather than just recognising the word.

Notice the two conditions hiding in that definition — crossing an official boundary, and intending to stay. A tourist crossing a border isn't migrating (no intention to stay). A commuter crossing a city boundary every day for work isn't migrating either, even though they cross a line — they're not settling there. This is why the mind map in the source material separates "Temporary/Circular Commuting" out from true migration pathways.

Immigration vs Emigration — don't mix these up

This trips up more students than you'd expect, purely because the words look so similar:

2. Voluntary vs Involuntary Migration

Every single migration example you'll ever be given can be sorted using two independent questions. Get in the habit of asking both — this is exactly how the exam mark scheme is structured (see the worked example in the source material).

Voluntary Migration

This is free choice of movement, and it's usually driven by economic reasons — a better job, a promotion, higher pay — although personal reasons (marriage, retirement, lifestyle) count too. Here's the pattern worth memorising:

• In developing countries, voluntary migration is usually internal, rural → urban (people chasing city jobs)
• In developed countries, counter-urbanisation is more common — the reverse flow, urban → rural

Involuntary (Forced) Migration

Here the migrant has no choice but to leave. This is usually international, but can absolutely be internal too — that's a common misconception worth correcting right now.

The two biggest global drivers of forced migration are war and persecution:

• Syrian Civil War — over half the country's population (13 million people) has been forcibly displaced
• Ethnic cleansing — e.g. Rwanda 1994, where Hutus attempted to eliminate Tutsis in just 3 months, forcing 2 million people to flee

Not every forced migrant leaves their country — someone who is forced to move but stays within their home country's borders is called an internally displaced person (IDP). This matters because refugee status (with UN protections) generally only applies once you cross an international border.

3. Push and Pull Factors

This is the engine behind every migration decision, forced or voluntary. Think of it like a tug of war: the push is the rope pulling you away from where you are, and the pull is the rope pulling you toward somewhere else.

These factors are then sorted into four categories — a useful structure for essay answers:

The Full List Worth Memorising

4. Barriers to Migration

Wanting to move isn't the same as being able to move. Barriers explain why push and pull factors don't always translate into actual migration — three types of barrier exist, and you should be able to name all three.

Personal Barriers

These are emotional and financial. The financial side breaks into three stages of cost:

• Closing-down costs — selling a home, legal fees
• Moving costs — transport, packing, shipping, visas
• Setting-up costs — renting/buying a new home, legal fees, schooling

On top of the money, there are emotional costs: never seeing loved ones again, leaving behind a culture and country you know.

Legal Barriers

Immigration laws present the greatest legal barrier to migration. A country can simply refuse entry, regardless of how strong someone's push and pull factors are.

National Barriers

These operate at a physical or political level:

• Distance between origin and destination
• Physical danger (crossing deserts, seas, conflict zones)
• Being physically blocked from leaving a country

5. Global Migration Trends

These statistics show up constantly in exam mark schemes as supporting evidence — memorise a handful of the most striking ones rather than trying to hold all of them.

Other trends worth knowing:

• COVID-19 severely restricted migration, though numbers are slowly recovering
• Female migration is rising — women make up most contract employment migrants, which tends to make their migration temporary and circular
• Most movement is developing → developed countries, but movement between low/middle-income developing countries is also increasing
• Human trafficking has increased as developed nations tighten border controls, pushing desperate migrants toward exploitative illegal routes
• Major migration corridors run from developing economies toward France, USA, Germany, and Saudi Arabia
• Globalisation makes migration movements faster and easier overall

6. Internal Population Movements

Here's a fact that surprises a lot of students: internal migration is actually higher than international migration, and this is true in both developing AND developed countries. It's just less visible because it doesn't cross a headline-grabbing border.

Rural-to-Urban Migration

In developing countries, most internal movement flows from poorer rural areas to wealthier, developing urban areas, driven by the search for better standards of living.

Since the 1950s, cities like Dhaka, Cairo, Nairobi, and São Paulo have grown rapidly this way. Interestingly, even when there's no guarantee of finding work, people still move — because the perceived opportunities at the destination are still seen as greater than what's available at the point of origin. This is an important idea for evaluative answers: migration decisions are based on perception, not certainty.

7. Depopulation & Counter-Urbanisation

Rural Depopulation

Developed countries like the USA, France, Germany, and the UK experienced rural-to-urban migration since the late 18th century due to the Industrial Revolution. This has driven depopulation in many rural areas — and it's generally the most isolated regions that suffer the worst. Crucially, once this cycle starts, it becomes self-reinforcing.

The Rural Depopulation Cycle

This is a genuine vicious cycle — trace it through step by step:

Counter-Urbanisation

Since the 1970s, overcrowding, pollution, and rising costs in cities have pushed the reverse trend: people moving from cities to rural areas. Reasons include:

• Increased personal car ownership, public transport, and road improvements — improving mobility to remote areas
• Increased wealth, making housing and travel more affordable
• Mechanisation and farm mergers → agricultural decline → more housing becomes available as workers leave
• The green belt pushing people to travel further out for a rural lifestyle
• Second homes and early retirement bringing urban people to the countryside

8. Impacts of Migration

This is the topic most likely to appear as a big extended-writing question, because it has three distinct "angles" you need to cover: the destination, the origin, and the migrant themselves. Examiners want to see all three, with both positives and negatives for each.

That said, some argue these effects are harmful — that cultural identity is being lost through both international and internal migration. A strong exam answer acknowledges both sides.

Impacts on the Country of Destination

Impacts on the Country of Origin

Impacts on the Migrants Themselves

9. Remittances

Remittances have the most positive impact on a country of origin — this single line is worth remembering word for word, because it's exactly the kind of statement an exam wants echoed back.

Remittances matter enormously — they can account for as much as 20% of a country's annual GDP. Here's what they do:

• Help decrease poverty
• Create a multiplier effect, increasing investment in an area
• Soften the impact of a global recession

Major remittance sources: USA, Germany, UK, western Europe, the Persian Gulf. Top 5 recipient countries (2021): India, China, Mexico, Philippines, and Egypt.

10. Case Study: Mexico → USA

This is one of the largest international labour migration streams in the world, and it's the go-to example examiners expect for questions on international migration. If your school studied a different case, use that one instead — but the structure below is exactly how any case study answer should be organised.

Background

• Two smaller surges in the 1920s and 1950s, when the US government encouraged temporary recruitment of Mexican guest workers
• Persistent mass migration only took hold over the last 40 years
• Higher concentrations of Mexican migrants in California, Arizona, New Mexico, and Texas — due to proximity to the border, demand for immigrant farm workers, and long-established Mexican communities
• 24% of foreign-born US residents are Mexican (over 10.9 million people)
• Mexicans account for 51% of all unauthorised immigrants in the US (Migration Policy Institute, 2020)

Migration numbers have decreased recently due to tougher immigration enforcement, a strengthening Mexican economy, increased US Border Patrols, and COVID-19.

Push & Pull Factors — be place-specific

Also worth noting: high population growth in Mexico causes faster labour force growth than the job market can absorb, intensifying competition for the few available jobs — a push factor rooted in demographics, not just economics.

Impacts on Destination (USA)

Impacts on Origin (Mexico)

11. How to Answer Case Study Questions

Case study questions (e.g. "For a named country you have studied, explain why it has attracted large numbers of international migrants") are level-marked. Understanding the mark bands is the single highest-value thing you can do to boost your score on this topic.

Practical steps for a Level 3 answer:

1. State the country (or countries) explicitly at the start of your answer
2. Never be generic — "migrants come from rural areas" tells the examiner nothing place-specific
3. Be place specific: "more migrants move from the northern states of X and Y to Z because..."
4. Link your statements — don't just list facts, explain the chain of cause and effect

What to Memorise

Concepts Checklist

• I can define migration and explain the UN's "permanent" threshold (1+ year)
• I can correctly distinguish immigration from emigration
• I can classify any migration example using both voluntary/involuntary AND internal/international
• I understand that forced migration can be internal (IDPs), not just international
• I can define push and pull factors and give social, economic, political and environmental examples of each
• I can name the three types of barrier to migration (personal, legal, national)
• I know key global migration statistics (281m migrants, 89.3m displaced, regional distribution)
• I understand why internal migration exceeds international migration
• I can explain the rural depopulation cycle step-by-step and why it's self-reinforcing
• I can explain counter-urbanisation and give at least 3 causes
• I can give positive and negative impacts of migration on destination, origin, AND the migrant
• I can define "brain drain" and explain why it harms the country of origin
• I can explain remittances, the multiplier effect, and give two explained benefits
• I know the Mexico–USA case study: push/pull factors and impacts on both countries
• I understand the level-mark bands for case study questions and why naming examples is essential

Exam Tips & Common Mistakes