Migration is studied carefully across three fields. Behavioural economics explains how a decision gets made under pressure. Psychology explains what arrival and adaptation do to a person. Anthropology explains how families and whole communities are reorganised across distance. Each idea below is published work, named and linked, written here in plain language and connected to the human experience it describes.
Behavioural economics
How people actually decide when the stakes are a whole life and the information is thin.
Loss aversion and the reference point
People judge a possible future against the life they already know, and a loss weighs far heavier than a gain of the same size.
What it predicts
Families stay longer than a purely financial calculation would suggest, then move suddenly once the home situation itself starts to feel like the loss.
What it looks like in a life
A mother who turned down three chances to leave goes within a month of the school closing, because staying finally became the risk.
Daniel Kahneman and Amos Tversky, prospect theory, 1979
What arrival, loss, and belonging do to a mind over years rather than days.
Four ways of adapting
Arriving people navigate two questions at once: how much of the culture of origin to keep, and how much of the new culture to take on. The combinations give integration, assimilation, separation, and marginalisation.
What it predicts
Integration, keeping both, is consistently linked to better wellbeing than any of the other three.
What it looks like in a life
A teenager speaks one language at the table and another in class, and thrives when neither one has to be surrendered.
The strain of language, status loss, discrimination, and unfamiliar systems produces a measurable load on health, distinct from the trauma of any journey.
What it predicts
Distress often peaks one to three years after arrival, not on the first day.
What it looks like in a life
The hardest year is the second one, when the welcome has quieted and the bills have not.
John W. Berry and colleagues; later clinical work on migrant mental health
How families, rituals, and networks make movement possible and give it meaning.
The in between state
Migration follows the shape of a rite of passage: separation, a long threshold where a person is neither what they were nor what they will be, and eventual reincorporation.
What it predicts
The threshold years, waiting for status or recognition, carry their own distinct suffering and their own solidarity.
What it looks like in a life
Three years of being nobody's citizen, in a room full of people in exactly the same position.