Originally written as a series of newspaper articles in 1847, Wage-Labor and Capital were intended to give an overview of Marx's central theories regarding the economic relationships between workers and capitalists. These theories outlined include the Marxian form of the Labour Theory of Value, which distinguishes "labor" from "labor-power", and the Theory of Concentration of Capital, which states that capitalism tends towards the creation of monopolies and the disenfranchisement of the middle and working classes. These theories were later elaborated in Volume 1 of Capital, published in 1867. Karl Heinrich Marx FRSA was a German philosopher, a critic of political economy, economist, historian, sociologist, political theorist, journalist, and socialist revolutionary. His best-known titles are the 1848 pamphlet The Communist Manifesto and the four-volume Das Kapital.