'I should have written you after my first reading of The Living Currency ; it was already breath-taking and I should have responded. After reading it a few more times, I know it is the best book of our times.' Letter to Pierre Klossowski from Michel Foucault, winter 1970. Living Currency is the first English translation of Klossowski's La monnaie vivante . It offers an analysis of economic production as a mechanism of psychic production of desires and is a key work from this often overlooked but wonderfully creative French thinker.