All six trend types, the book shows, are shaped by forces internal to the dynamics of populations themselves. Most frequently, they increase in a constantly proportionally slowing curve as a specific stimulus is spent through expansion. With shocks like war or epidemics, they contract according to an upside down version of this curve. The only two curves until recent times, these are still the most common in local populations. With modern economic and social change, some populations--mostly larger ones--follow one of four newer growth patterns, either increasing at a steady rate, growing in a gradually slowing pattern between this constancy and the rapidly decelerating basic growth curve, exploding in an accelerating fashion, or in a few ominous cases, decreasing in an accelerating decline. Where these curves occur depends on the distinctive ways populations interact with economic changes. Harris's findings have profound implications for understanding economic and social change. These implications will be discussed in the following volume.
![The History of Human Populations The History of Human Populations](https://www.angusrobertson.com.au/images/9780275971311.jpg?width=250)
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