An earlier version misstated the value of the proposed offer.
This article has been updated to reflect that Joshua Bamfield is at the Centre for Retail Research.
This version corrects the title of Broadwell's book, "All In: The Education of General David Petraeus."
This version corrects the spelling of ReWater and Fleischli.
The chart in this story has been updated to reflect that first-quarter revenue for Chipotle was $1.09 billion and for McDonald's it was $5.96 billion.
Editor's Note: This story has been updated to clarify the timeline of the trade in the context of a tweet and a Dow Jones Newswire headline.
This article had been updated to correct the spelling of V. Stiviano's name.
This slideshow has been updated to reflect Burger King's total revenue.
This story has been updated to reflect that IBM's earnings per share in the first quarter of 2014 were $2.68.
An earlier version of this article incorrectly named one of the institutions involved in a study on drug research.