Migration:Does it put rural workers and their families at a permanent disadvantage?

Migratory flows (internal and external), causes and effects.Is immigration good for the economy? For employment? For wages? How important is illegal immigration in the US (or other countries) and what are its effects? 3 China’s rural migrant workers; their role in China’s rapid economic growth. Are they included in social programs? How does the hukou (or huji) system of household registration work? What effects has it had on labor markets and GDP growth? On employers? On China’s structural transformation? Does it put rural workers and their families at a permanent disadvantage?