He was previously a teacher of economics at the '' École Polytechnique '' , and has written on the evolution of contemporary capitalism , particularly in his 2005 book `` Le capitalisme total '' , published by the `` La République des idées '' think tank .
Long time economics teacher at the '' École Polytechnique '' , he has written books about the evolution of contemporary capitalism , including `` Le capitalism total '' published through the think tank of `` La République des idées '' in 2005 .