The Ideas of Daniel Quinn, base on ideas of evolution.The pressure of population growth aka Food Race

The pressure of population growth
Interestingly, Darwin and Wallace found their inspiration in economics. An English parson named Thomas Malthuspublished a book in 1797 called Essay on the Principle of Population in which he warned his fellow Englishmen that most policies designed to help the poor were doomed because of the relentless pressure of population growth. A nation could easily double its population in a few decades, leading to famine and misery for all.

When Darwin and Wallace read Malthus, it occurred to both of them that animals and plants should also be experiencing the same population pressure. It should take very little time for the world to be knee-deep in beetles or earthworms. But the world is not overrun with them, or any other species, because they cannot reproduce to their full potential. Many die before they become adults. They are vulnerable to droughts and cold winters and other environmental assaults. And their food supply, like that of a nation, is not infinite. Individuals must compete, albeit unconsciously, for what little food there is.
http://evolution.berkeley.edu/evolibrary/article/history_14

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