“These manipulations are so serious, if it happens again in future, we must ensure that those who do it again go to prison.” September 28, 2012 04:44 PM LinkedIn X Show more sharing options Copy Link URLCopied! Print LinkedIn X —Michel Barnier, E.U. commissioner for internal markets and services, on the need for tougher regulation, supervision and enforcement to deter market manipulation in light of the recent Libor scandal.