Watch Out, Wall Street!  The Federal Reserve, a Primary Banking Regulator, is Trying Harder to Spot Speculative Excesses Peter Eavis at The New York Times Dealbook reports: In a speech on Thursday, governor Jeremy C. Stein, who joined the Fed last year, focused on parts of the financial markets that show signs of overheating. He went into considerable detail, citing metrics that appear designed to spot bubbles. Specifically, Mr. Stein raised a red flag about junk bonds and mortgage-backed securities, and how investors are financing their purchases of such assets.