One of the earliest critics of Malthusian theory was Karl Marx who referred (in "Capital", see Marx's footnote on Malthus from Capital - a reference below) to it as "nothing more than a schoolboyish, superficial plagiary of De Foe, Sir James Steuart, Townsend, Franklin, Wallace" and others, postulating that progress in science and technology would allow for indefinite exponential population growth.