This is WEEKEND EDITION from NPR News. I'm Jacki Lyden. Checking on your retirement and mutual fund statements is getting a bit less scary. The stock market cleared another hurdle this week with the S&P 500 closing above 1,400 for the first time in almost four years, and the Dow Jones Industrials up almost 25 percent from in recent low back in early October. NPR's John Ydstie is here to tell us what's driving the market. John, thank you for coming in.