Why Toyota Stock Popped on Thursday

Toyota Motor (TM 8.45%) stock burned rubber this morning, ripping ahead 7.8% through 10:10 a.m. ET. But what's behind today's sudden rise?According to Bloomberg, it's "expectations of a higher return-on-equity" from the Japanese automaker, and in particular, rumors Toyota wants to "double" its return on equity. What is return on equity?The Motley Fool defines return on equity as a company's net income divided by shareholders' equity -- but basically you can think of ROE as just a measure of how profitable t ...