Alfred Wallace (1905) also reports in his autobiography that "perhaps the most important book I read was Malthus' Principle of Population...its main principles remained with me as a permanent possession, and twenty years later gave me the long-sought clue of the effective agent in the evolution of organic species."
Gerhard and Jean Lenski present an evolutionary-ecological
theory as an integrating device, synthesizing both the classical works
of sociologists and anthropologists and contemporary social theory and
findings. In their acknowledgments to their 5th edition of Human
Societies, the Lenski's acknowledge their debt to many social scientists,
Malthus being the first among them (1987: xv). The Lenski's present
an ecological-evolutionary theory of social organization and change that
is profoundly influenced by Malthus.
Malthus' Social Theory