NEW YORK — The stock market suffered its worst setback in more than 10 months this week as investors decided no matter what the news, it must be bad.

Since Wednesday, the Dow has lost 552 points, or 5.2 percent. All the major indexes fell more than 2 percent yesterday.

Investors continued to worry about President Obama's plan to restrict big banks. They decided that good earnings reports weren't good enough. They didn't like mounting opposition to the reappointment of Federal Reserve Chairman Ben Bernanke. And they were still uneasy that a possible economic slowdown in China might spread.