The essential work from the Nobel Prize-winning virtuoso of twentieth-century economics, translated to English for the first time. Few scholars advanced the frontier of economic modeling more than French economist Maurice Allais. Allais-s contributions-beyond his famous Allais-s Paradox-earned him the Nobel Prize and drew comparisons to the works of Paul Samuelson and even some modern mathematical behavioral economists.-Allais-s accomplishments, however, went largely unread by non-Francophone readers due to the challenge of their translation for publishers. The effects of this gap are immeasurable. As Paul Samuelson wrote, -Had Allais's earliest writings been in English, a whole generation of economic theory would have taken a different course.- Economy and Interest-is the milestone translation of Allais's most influential work, one whose staggering findings predate their accepted formulations by other famed economists decades later. In its sweep and technical virtuosity, Economy and I