Of course you're right, but that's a pretty high standard to hold him to. You'd have to say the same thing about CEOs who behave in a way you support, too. ("Yeah, their stock improved after he started treating employees with respect, but how do you know they couldn't have done better without that change in behavior?")

Well, here's one clue from Google Finance's weekly price data: in the three weeks before he sent the memo the price had dropped from $29.407 to $21.063 - a 28% drop. Oddly enough, the 3/23 Friday close of $17 (just after the memo went public) marked the bottom of that stock decline. A month later the stock closed up at $21.55.

Generally speaking, warm fuzzy bosses don't mean spit to a stock's price, while layoffs can sometimes improve it. The perception that a division's managers are ineffectual, however, could hurt a lot. The story that a CEO was starting to kick managerial ass could improve investor's assessment of the company's chances. Certainly the price data supports the argument that the CEO's actions stopped the price erosion.