Microsoft CEO Steve Ballmer speaks at a special media event to announce the next generation Windows Phone, Windows Phone 8, at the Bill Graham Auditorium in San Francisco on October 29, 2012. - 

American companies that earned money overseas are looking for ways to spend it so they can avoid paying American taxes. This could be one of the reasons behind Microsoft's recent purchase of much of Nokia of Finland for more than $7 billion. Allan Sloan, senior editor-at-large for Fortune magazine, joins Marketplace Morning Report host David Brancaccio to discuss.