Lloyd Blankfein, chief executive of Goldman Sachs, on Wednesday admitted that banks lost control of the exotic products they sold in the run-up to the financial crisis, and said that some of the instruments lacked social or economic value.

In a speech to the Handelsblatt banking conference in Frankfurt, he also repeated an attack, first made in the spring, on Wall Street compensation practices, calling the furore over bankers’ pay “understandable and appropriate”.