source: http://www.populationaction.org/Publications/Reports/The_Shape_of_Things_to_Come/Chapter_Six_Subtypes_and_a_Speculative_Structure.shtml
A population profile is a demographic display of a population's age distribution. On the "y" axis are age categories (usually ranging about 5 years) and on the "x" axis is the share of or total population within that age range. A population profile is useful in understanding the fertility and mortality of a particular population - depending on the shape! For instance a pyramid shape would signal high fertility and high mortality.
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