James Bullard, Federal Reserve Bank of St. Louis President, says the Fed should debate the meaning of a flattening yield curve. Alan Krueger, Princeton University Professor, says we'll see less infrastructure investment because of the tax bill. Bill Gross, Janus Henderson Fund Manager, says we're in a bond bear market but we won't lose a lot of money. Gary Cohn, National Economic Council Director, says the economy will continue to grow and add jobs.