I hold it perniciously false to teach that all cultural forms are equally probable and that by mere force of will an inspired individual can at any moment alter the trajectory of an entire cultural system in a direction convenient to any philosophy. Convergent and parallel trajectories far outnumber divergent trajectories in cultural evolution. Most people are conformists. History repeats itself in countless acts of individual obedience to cultural rule and pattern, and individual wills seldom prevail in matters requiring radical alterations of deeply conditioned beliefs and practices.
At the same time, nothing I have written in this book supports the view that the individual is helpless before the implacable march of history or that resignation and despair are appropriate responses to the concentration of industrial managerial power. The determinism that has governed cultural evolution has never been the equivalent of the determinism that governs a closed physical system. Rather, it resembles the causal sequences that account for the evolution of plant and animal species.

Author: Marvin Harris