Testifying before lawmakers Thursday, Ben Bernanke reiterated a call for the Fed to be given supervisory powers over institutions that pose a systemic risk to the financial system, and proposed that a council of regulators help monitor risk.

Paul Solman: When in Pittsburgh last week for the G-20 meetings, we interviewed Columbia University economist Jeffrey Sachs, 23 years after our first interview with him. In all these years, Sachs has been a champion of both the verities…

Editor’s note: All this week on the Business Desk, we are featuring contributions from economists, financial journalists, and other experts on the origins and impact of the financial crisis. Today, we asked several experts to weigh in on the…