By James Kwak
Tom Hayes was a trader at UBS and Citigroup who was very, very good … at rigging LIBOR. This week, he was convicted in the United Kingdom of conspiring to manipulate the benchmark interest rate and sentenced to fourteen years in prison.
There’s little doubt that Hayes was guilty as charged. In his defense, he argued that he had no idea what he was doing was wrong. But contrary to what some armchair attorneys think, that doesn’t matter. In general, the famous mens rea (guilty mind) requirement isn’t that you know you are breaking the law at the time; it suffices if (a) you know you are doing a thing and (b) that thing is against the law. There’s no question that Hayes knew he was conspiring to rig LIBOR, and that’s enough for the prosecution.
And on one level, it’s good that he was convicted and got…
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