Population Pyramids and things like that

     Today we started to learn about population pyramids. I don't really see the point of these except to plot data instead of just reading it, but who cares what I think. A population pyramid measures the growth or decline of fertility, mortality, and migration to cities. Each age group is measured in five year age increments. Children are considered to be nineteen and below, economically active/ adults are twenty to sixty four, and senior citizen are sixty five to over eighty. Statistically, seniors cost more money than children, because when they get ill, they become extremely ill, and it costs lots of money to treat them. The basic shapes of population pyramids are the Christmas tree, the box, and the cup. The Christmas tree represents a developing nation where population growth is high, birth rate is high, and the life expectancy is short. The box symbolizes a developed country with low infant mortality, slow population growth, and a long life expectancy. The final shape, the cup, represents a developed country where the birth rate is low, the population is shrinking, and there a long life expectancy. An example of the cup is Namibia as well as Bangladesh. Two examples of the box are the Unites States of America and Sweden. An example of the cup is Japan. Hopefully if you're some random person on the internet you learned something if not, oh well.