Since 1999, Menahem has been a member of the Scientific Advisory Council of ATTAC [REF].
Since 2008, Menahem has also participated in the "Forum for Alternative Indicators of Riches" (FAIR more known according its French acronym[REF]) which was founded in order to monitor the activities of the "Commission on the Measurement of Economic Performance and Social Progress" chaired by Joseph Stiglitz.