How does a population grow? Cities and countries grow through natural growth (births minus deaths), changing boundaries, and population movement. The highest population growth is in the poorer...

How does a population grow? Cities and countries grow through natural growth (births minus deaths), changing boundaries, and population movement. The highest population growth is in the poorer countries. Malthusian theory holds that population growth is geometric and leads to inequality. Marx disagreed and said it is the unequal distribution of resources among the increased population that leads to inequality. Zero population growth was Erlich’s solution and entails a global effort to curtail population growth. Many organizations and nations are trying to stem population growth, which demographic transition theory shows is tied to technology.