Sierra's St. Aubin: 'I don't think you can rule out a significant downturn'

James St. Aubin, chief investment officer at Sierra Investment Management, says that we are looking at 'unusually uncertain times given what the market is trying to process right now,' specifically how the increased cost of credit and the decreased availability of credit will work its way through the economy. St. Aubin -- who uses a quantitative, tactical approach -- says the market could go in any direction from here, but he notes that there is more downside risk here even though the economy appears to be only facing a mild recession. He says that equity markets look vulnerable now, which should make investors consider risk management to ride things out. In the Market Call segment, David Rolfe, chief investment officer at Wedgewood Partners, talks about picking highly concentrated stock portfolios, plus Chuck answers a listener's question about whether or not to pay down debt -- rather than plow money into savings -- while inflation is running higher than standard dividend yields or interest rates on bank deposits.