Wall Street's most influential investor has some big ideas for fixing the world's largest economy When the richest man on Wall Street talks about the markets, you have to listen. And Carl Icahn, the financier Donald Trump recently said he’d choose as his Treasury Secretary, is talking. Icahn doesn’t really want the job. But in a video released Sept. 29, he sounds like a man with a well-considered plan for the office. In the spot, he offers up serious warnings about the financial bubbles brewing right now as well as advice for Fed chair Janet Yellen and the next President....