Explaining Migration: From Ravenstein to Network Theory

Scholars have long tried to explain why people move. In 1885 the geographer E. G. Ravenstein published his laws of migration, observing that most migrants moved short distances, often in steps, and towards growing cities. In 1966 Everett Lee developed the push-pull model, which weighed factors at origin and destination along with obstacles in between. Later researchers argued that individual choice is only part of the story: network theory shows that contacts abroad lower costs and risks, which is why migration clusters along family and village links.

World-systems approaches link migration to global inequality and to historic ties between former colonies and colonial powers, such as South Asians moving to Britain. Each theory highlights something different, and historians combine them. Comparing them teaches an important skill: asking what a model explains well and what it leaves out.