More children are born because with the ease in which they die, it is necessary for more support in the home. In Afghanistan, where there is extreme and bitter poverty, the average number of children born to a woman is almost seven. In the United States and Japan, the birthrate is at if not lower than zero population growth. In these countries there would be a decrease in population leading to more wealth per capita, but in countries with increasing population and quite often decreasing gross nation product, the per capita income would decrease even more from the already pathetic point. Cultures that are more agrarian in nature can been seen as have higher birthrates than nations that are more industrialized. The reason being is that, when there are more bodies, more work can be done leading to an increase in any profit that might be made, Parents can also look forward to being supported by at least one of their children when they are too old to work and need to be cared for. Often the peoples of these low-income nations do not realize the complications of large families. With a large number of children, there is a tremendous amount of food needed even to just keep the children alive and in many of the countries, when daughters are sent off to be married, a dowry is expected. Families might not be able to establish a "decent" dowry with an extraordinarily limited income and six or seven mouths to feed as well. .

             When there is an increase in life expectancy, the population increases as well, because as people are growing older and older, not dying, and more and more children are being born. The average life expectancy in The United States is seventy six years. The United States is also one of the most advanced countries in the world. Advanced, of course referring to all of the technological, agricultural and medical abilities that can be demonstrated, and more importantly practiced due to the high wealth of the nation.