This book is an English translation of Essays on Marx's Theory of Value, first published by Isaak Illich Rubin in 1923 in the Soviet Union. Rubin's book sparked a fierce value controversy with contemporary Soviet economists during the late 1920s. As such, the present translation is conceived as a variorum edition, including for the first time in English all the essential supplementary materials related to this foundational work in Marx's value theory. In addition to Rubin's main work, this edition includes his four most important related publications, as well as ten debate articles written and published by his contemporary proponents and opponents.