Understanding Migration: Theories Based on Individual Choices

People rarely pack up their lives on a whim. A construction worker boarding a train from Bihar to Mumbai, a software engineer accepting an offer in Bengaluru, a young woman moving to Pune for a college seat – each decision is shaped by a tangle of personal calculations, family expectations, and the realities of where they live versus where they hope to go. Migration theories that focus on the individual try to unpack exactly this: how a single person weighs the costs, benefits, and obstacles before making the move. These models help us see migration not as a faceless statistic but as the sum of millions of personal choices.

Why the individual approach matters 🔗

Migration scholarship broadly splits into two camps. Macro-level theories look at large structural forces – colonial histories, world systems, labour market segmentation – while individual or micro-level theories zoom in on the migrant as a decision-maker. The individual approach assumes that, even within heavy structural pressures, people still assess their options, compare alternatives, and act. This perspective gained traction in the 1960s and remains foundational to how demographers, economists, and policymakers analyse mobility.

The approach is especially useful in a country like India, where the number of internal migrants stands at roughly 45.36 crore, making up about 37% of the country’s population. Behind that enormous figure are individuals making rational, emotional, and sometimes desperate choices about where they can build a better life.

Push and pull factors of migration 🔗

The most enduring framework in individual migration theory is the push-pull model. It argues that every act of migration is shaped by two opposing sets of forces: conditions that push a person away from their place of origin, and conditions at a destination that pull them in.

Push factors: what drives people away 🔗

Push factors are negative circumstances at the place of origin that make staying difficult or undesirable. In the Indian context, the most common push factors include agrarian distress, unemployment, low wages, environmental degradation, and the absence of basic services. These factors typically include economic hardships, lack of employment opportunities, poverty, environmental disasters, political instability, conflict, discrimination, and social or religious persecution.

For instance, recurring droughts in Marathwada have pushed thousands of farming families toward Pune and Mumbai. Similarly, cyclone-prone coastal districts of Odisha and West Bengal see steady out-migration after major weather events destroy livelihoods.

Pull factors: what attracts people 🔗

Pull factors are the positive features of a destination that draw migrants in. Higher wages, better educational institutions, advanced healthcare, infrastructure, and the possibility of upward mobility all count as pull factors. Urban workers, engaged in manufacturing, tend to produce a higher value of output than their agricultural counterparts, and the resultant higher urban wages might tempt surplus agricultural workers to migrate to cities.

The pull is real and measurable. Urban construction workers in metros can earn two to three times what comparable rural work pays, even after accounting for the higher cost of city life. Out-migration states like Bihar, Uttar Pradesh, Jharkhand, Odisha, and Rajasthan consistently send workers to in-migration hubs such as Delhi, Mumbai, Pune, Surat, Ahmedabad, and Bengaluru.

The interplay between push and pull 🔗

Real migration decisions are rarely driven by push or pull alone. A landless labourer in eastern Uttar Pradesh might face stagnant wages at home (push) while hearing from a cousin about steady construction work in Gurugram (pull). The two forces work together. Push factors tend to produce migration that is less selective – when conditions become unbearable, a wide range of people leave. Pull factors, by contrast, often produce more selective migration, attracting those with the skills, information, and resources to take advantage of opportunities.

Lee’s conceptual map of migration 🔗

Everett S. Lee (1917-2007) developed categories that demographers use to analyse human migration from former areas to new host locations. Lee first presented his model in 1965 and published it in 1966 in the journal Demography. His framework remains one of the most cited in migration studies because it organises a messy reality into four clear analytical categories.

The four factors in Lee’s model 🔗

Lee proposed that every act of migration is shaped by four interacting elements:

Factors associated with the area of origin: Every place has positive features that hold people there, negative features that repel them, and neutral features. A village might offer the comfort of family and familiar culture (positive), poor schooling and low wages (negative), and a moderate climate (neutral). Lee argued that residents have near-perfect information about their place of origin because of long association.

Factors associated with the area of destination: The destination also has its mix of positives, negatives, and neutrals. The crucial difference is that potential migrants usually have imperfect information about destinations. They rely on letters, phone calls, social media, returning migrants, and rumour. This information gap helps explain why some moves succeed brilliantly while others end in disappointment.

Intervening obstacles: Between origin and destination lie obstacles that can stop or slow migration. Distance is the most obvious, but transport costs, language barriers, immigration rules, caste networks, and family obligations also count. According to Lee, distance, while omnipresent, is by no means the most important factor, and the effect of intervening obstacles varies from individual to individual.

Personal factors: Migration is ultimately a human decision shaped by age, gender, education, marital status, ambition, fear, and personality. Two people facing identical push and pull factors may choose differently because of who they are. This is why migration is selective, not random.

Hypotheses derived from Lee’s model 🔗

Lee used his framework to generate testable hypotheses about migration. He suggested that the volume of migration in an area varies with its diversity – heterogeneous regions encourage more movement because they offer more contrasts in opportunity. He also argued that migration tends to be selective, with migrants differing in important ways from non-migrants in their place of origin. And he noted that pull-driven migration tends to attract more skilled and educated people, while push-driven migration tends to include a broader cross-section of the population, including those with fewer resources.

Other individual models of migration 🔗

While Lee provided the most influential individual framework, several other scholars contributed important refinements.

Duncan’s theory of farm population mobility 🔗

Otis Dudley Duncan, in his work “The Theory and Consequences of Mobility of Farm Population,” offered a theory that bridges the individual and the structural. According to Duncan, whatever effects are created by changes in structural factors of a country, the same effects are caused by migration, making migration a functional alternative to social change.

Duncan’s insight is subtle but powerful. He argued that when a society fails to reform itself – when caste hierarchies, land tenure systems, or unequal opportunities remain rigid – individuals respond by moving. Migration becomes a personal substitute for collective change. A young Dalit graduate who cannot find dignified work in a feudal rural setting might migrate to a city where their identity matters less in the labour market. The personal decision to move is, in effect, a structural correction performed one person at a time. Duncan combined microscopic motivations (individual aspirations) with macroscopic forces (structural inequalities) to explain why farm populations move.

Standing’s contribution: aspirations and labour circulation 🔗

Guy Standing, a labour economist who spent years at the International Labour Organization, brought attention to two ideas that enriched the individual approach. The first is the concept of aspiration wages, which he developed in his 1978 paper “Aspiration Wages, Migration and Urban Unemployment.” Standing argued that migrants do not simply move toward the highest available wage; they move toward the wage they aspire to earn. This explains why migrants in cities often endure long spells of unemployment rather than accept low-paid work – they are holding out for a job that meets their expectations, shaped by family pressure, peer comparisons, and the social meaning of certain occupations.

The second is labour circulation. In his 1986 paper on labour circulation and the urban labour process, Standing examined how workers move repeatedly between rural and urban areas rather than settling permanently. Circular migration is a defining feature of Indian labour markets. Sugarcane cutters from Maharashtra, brick-kiln workers from Odisha, and harvest hands from Bihar move with the seasons, returning home to plant or to celebrate festivals. Standing’s framework helps us see these workers not as failed migrants who could not settle, but as people making rational choices to balance income earning with family ties and rural assets.

The Lewis model: wage differentials as the engine 🔗

Sir William Arthur Lewis, who won the Nobel Prize in Economics in 1979, proposed his dual-sector model in a 1954 article titled “Economic Development with Unlimited Supplies of Labour.” Though often classified as a development theory rather than a pure migration theory, the Lewis model centres on individual responses to wage differentials.

The Dual Sector Model is a theory of development in which surplus labour from the traditional agricultural sector is transferred to the modern industrial sector, whose growth over time absorbs the surplus labour, promotes industrialisation and stimulates sustained development. Lewis argued that the agricultural sector in developing economies has surplus labour with very low or even zero marginal productivity – meaning some workers could leave without reducing total output. Industries in cities, by contrast, offer higher wages.

This wage gap acts as the engine of migration. As long as urban wages exceed rural wages by a meaningful margin – Lewis suggested around 30% – workers will keep moving. Eventually, all the extra workers from the farming sector get hired by the modern manufacturing sector, and factories then have to compete with each other to start hiring more workers, raising wages – the point known as the Lewis turning point. India is widely debated to be approaching, but not yet at, this turning point.

Strengths and limits of the individual approach 🔗

The individual approach has clear strengths. It respects human agency, generates testable predictions, and helps policymakers design targeted interventions – skill training, transport subsidies, housing for migrant workers. It also explains why two villages facing similar conditions can have very different migration rates.

But it has limits too. Critics argue that focusing on individual choice can obscure the structural forces that shape choices in the first place. A landless farmer “chooses” to migrate, but that choice is constrained by land ownership patterns, caste, gender, and global commodity prices. Migration is rarely a free choice between equal options. The best contemporary research combines individual-level models with structural analysis to capture both the agency of the migrant and the conditions under which agency is exercised.

What do you think? If you or your family have a migration story, which of these factors – push, pull, intervening obstacles, or personal motivations – best explains the move? And do you think today’s young Indians are migrating more because of what they want to escape, or because of what they hope to find?

References

1. https://www.drishtiias.com/daily-updates/daily-news-analysis/india-s-internal-migration
2. https://geographicbook.com/the-lee-migration-theory/
3. https://www.tutor2u.net/economics/reference/lewis-model-of-structural-economic-growth-and-development
4. https://en.wikipedia.org/wiki/Push_and_pull_factors_in_migration
5. https://rashidfaridi.com/2018/04/05/migration-theories-lees-push-pull-theory/
6. https://www.sociologydiscussion.com/demography/migration-demography/top-3-theories-of-migration/3148
7. https://www.guystanding.com/journal-articles
8. https://onlinelibrary.wiley.com/doi/10.1111/j.1467-9663.1986.tb01723.x
9. https://en.wikipedia.org/wiki/Dual-sector_model
10. https://www.npr.org/transcripts/968412484