While some multimillionaires started in poverty, most did not. A study of the origins of 303 textile, railroad and steel executives of the 1870s showed that 90 percent came from middle- or upper-class families. The Horatio Alger stories of "rags to riches" were true for a few men, but mostly a myth, and a useful myth for control.
Howard Zinn (2015). “A People's History of the United States: 1492-Present”, p.254, Routledge