When Detroit became the biggest city in U.S. history to file for bankruptcy last month, it turned public attention to the municipal-bond market, where cities and states go to borrow money. Was this sleepy, often-overlooked area of the financial world actually dangerous?

Weak earnings from several U.S. companies helped drag the stock market lower Friday, putting major indexes on course for their first weekly loss this month.

A mix of good and bad earnings reports from big companies kept the stock market treading water in early trading Tuesday.

A pair of better economic reports helped nudge the U.S. stock market up in early trading Thursday, even as global markets headed lower.

A rout in global markets spread to the U.S. early Tuesday, wiping out the stock market's gains for the month.

An encouraging drop in claims for unemployment benefits helped the stock market edge higher in late morning trading Thursday.

Worries about Europe rattled the stock market Wednesday, a day after the Dow Jones industrial average had its biggest gain in three weeks.

Market pros call it the Great Rotation. That's the long-awaited scenario when investors take their money out of bonds and sink it into stocks.