Why most poor countries have highest population growth instead of rich ones. Poverty has a direct relation to the population growth. In developing countries of Asia and Africa, child labor, slave trading and human trafficking is highly prevalent. African countries for example still have maximum reporting of slave trading though trading of humans is legally banned everywhere in the world. People give birth to kids and sell them to rich people who in turn employ these kids in various laborious and unethical tasks. If not sell, these parents force their kids to beg or work at a very tender so as to earn some extra money for the family. These people believe that more kids mean more hands for begging and work and thus more money. Without concrete measures for growth and poverty eradication, other methods of population control may prove to be ineffective.