China has dealt with the problem of population growth by encouraging people to move to the cities and installing a one-child policy. They encourage people to move to the cities because of the increased number of industrial and business opportunities. People who work are less likely to have children. The cost of living in the cities is also higher, so there is incentive to keep families small by having to provide for fewer children. The one-child policy is a program that does not allow for families to have more than one child. The program does not apply to people living in extreme rural areas or to some ethnic groups. This is a very controversial program, and many consider it to be in violation of human rights.