We tend to think of migration in the international context, but a greater scale of migration takes place within a country. China estimates that some 3.6 billion trips will be made during the 40-day period surrounding the Lunar New Year holiday this year. Some are on vacation and business, but most are to return home. Baidu even visualizes this massive internal migration from one place to another on a China map.
People cross provincial boundaries for many reasons – to find jobs, to earn higher incomes, to attain better/higher education or skills, to access hospital and other public services, to join family members, or to escape political instability or violence. Research has shown that, of all these, average wage differences are the most important factor to explain internal migration.