Nielsen CEO Dave Calhoun said that the company's recent deal with Walmart to collect and report the big box retail giant's sales data as part of industry reports is "probably the most significant
event to date," in the five years he's been with the company. Calhoun made the comment to analysts on a call reporting the media and marketing research firm's second quarter earnings. The firm
reported a revenue climb of 10% to nearly $1.4 billion for the quarter, although 5% of the gain was due to favorable foreign exchange rates.