Capitalism was an economic system that emphasized profit and private ownership of the means of production. The Eighth Doctor was assumed to be a capitalist by several people in Spain. Fritz Kreiner branded Anji Kapoor a "capitalist pig" who was in turn surprised by how similar career communists and career capitalists were.
While fighting in the Spanish Civil War, Bob Edwards used a megaphone to shout out lengthy political arguments about the capitalist system. (EDA: History 101)