What has assisted China in the flow of return migration are central government policies. These policies are changes in the domestic environment, the freedom to immigrate and emigrate freely, political stability, and changes in how the government uses people. In addition, the local government was involved in the enhancement of return migration by cities rewarding the returnees with large bonuses from their home unit. There are also other reasons which encouraged the migration back to the home country, which were higher social status in China, better career opportunities in China, and patriotism.