Banks Will Always Suck At Trading, Badly Need A Volcker-Like Rule: Study

``A new study by economists Arnoud Boot at the University of Amsterdam and Lev Ratnovski at the International Monetary Fund finds that recent blow-ups in the banking sector -- JPMorgan Chase's $6.8 billion "London Whale" losses and that whole financial-crisis thingy, to name two -- are not isolated events, but "a sign of deeper structural problems in the financial system." The only prescription? Less trading by big dumb banks.''