There are differences in developed countries and developing countries. Developing countries are the lower class and middle class countries. These are the countries that have low income and are usually a poor country. The developed countries are the high income countries. There are a lot of factors to consider why these countries are the way they are. Fertility Transition is the decline of birthrates from high levels to low levels in a population. Fertility rate, poverty, pollution and education are just a few factors that affect the economy and the country.
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