The corridor, not the city, is the unit of migration

If you want to understand migrant labour in India, stop looking at cities. Look at corridors.

A city is where a worker happens to be standing this season. A corridor is the line he travels along, year after year, between the district he comes from and the cluster of factories that pull him in. Madhubani to Gurgaon. Eastern UP to NOIDA. The villages around Ranchi to the auto belt in Chakan. These are not abstractions. They are durable routes, and they were not built by any employer.

Corridors are built from relationships, not jobs

A worker does not follow a company. He follows the man from his village who went last year and came back with money and a phone number. He follows a cousin, a neighbour, the contact who said there is work and a place to sleep at the other end. The first migration is a relationship. Every one after it runs along the path that relationship opened.

This is why the employer is the wrong unit to build for. The employer changes constantly. A worker is at the solar plant in Oragadam this season and the electronics line in Sriperumbudur the next, and the corridor that carried him is the same both times. Build for the employer and you are tied to one factory's hiring, which empties the moment the order book softens. Build for the corridor and you sit underneath every employer along it, because the worker keeps moving between them while staying on the same line.

Build the corridor and you sit under everyone on it

This is the difference between a dormitory and infrastructure. An employer dormitory solves retention for one factory. It empties when that factory slows. Independent managed living, placed on the corridor and tied to no single employer, solves distribution for the whole line. The worker chooses it because it is his, not his boss's. Whoever controls where workers sleep controls where labour flows, and on a corridor that flow runs through dozens of employers, not one.

The corridor is also what makes continuity possible. A worker who moves three times in two years inside the same corridor is the same member to us each time. We already have his identity, his history, his savings record, his job preferences. We re-place him at almost no new cost, because the corridor kept him on the platform even as the employer changed. The relationship that built the corridor in the first place is the same thing that lets the platform compound along it.

So we do not expand city by city. We pick a corridor and we go deep, because density on one line beats a thin presence across ten. Get deep enough on a corridor and you are no longer a vendor to a factory. You are the layer the whole line runs on. The city is where the worker sleeps tonight. The corridor is the thing he never actually leaves.