According to professors Dimson, Marsh and Staunton, in the latest edition of their Global Investment Returns Yearbook, investors often do well out of investing in companies which operate in “sin industries” and in countries where corruption is most developed. Doing bad, in other words, can often mean doing good for investor returns. That set me wondering how scandal-riven banks might fit into this matrix. Is it fair to classify them as the market's new sectoral “sinners”? Banks provide many valuable services to customers around the world, and in a capitalist system it is as yet not a crime to lose money, although losses on the scale incurred in the great financial crisis from stupidly risky lending practices – in some cases verging on the fraudulent as well as criminally incompetent - cannot be so lightly dismissed.