Social Darwinism is a discredited sociological theory suggesting that strong people naturally increase their wealth and power, while weaker people are biologically prone to being poor.
In the 1870s, some sociologists took Darwin's theory of evolution and tried using it to explain dynamics in human societies. In social Darwinism, survival of the fittest means that people who are mistreated or struggle financially are biologically weaker and destined to remain at the bottom rung of society. Wealthy elites, according to this theory, are superior human beings. Social Darwinism lost credibility after World War II, when it was strongly associated with Nazism.