Earning management refers to using accounting techniques to manipulate financial statements. Some common techniques include overestimating expenses to build a "cookie jar" reserve for future use, taking large one-time write-downs or restructuring charges to remove future expenses ("big bath"), and acquiring companies solely to boost current earnings ("big bet on the future"). Motives for earnings management include influencing stock prices, meeting analyst expectations, and managing compensation contracts or regulatory requirements. While some techniques are legal, fraudulent reporting that intentionally misleads investors can have severe consequences, as seen in the 2008 collapse of Lehman Brothers resulting from hidden debt.