Economists are increasingly turning their attention to the problem of monopoly. This doesn’t mean literal monopoly, like when one utility company provides all the power in a city. It refers to market concentration in general — when an industry goes from having 20 players to having only 10, or when the four biggest companies in an industry start taking …

  Part of Warren Buffett’s mystique is his fondness for a good value. He still lives in an Omaha house he bought in the 1950s. Buffett’s license plate at one point read “Thrifty.” When it comes to Apple Inc., however, Buffett’s firm isn’t exactly plucking from the bargain bin. Berkshire Hathaway Inc. first disclosed a $1 billion stake in Apple …

  Is Europe heading back to financial mayhem? Bank of Greece Governor Yannis Stournaras warned this week that it might be. Any further delay in reaching agreement between Greece and its creditors, he said, risked a new recession and a fresh crisis of confidence across the euro zone. Maybe that’s a little alarmist — but he’s right about one thing. …