When a company axes its chief executive, its stock often plummets. But when the firing is part of a bigger overhaul, investors can win in the long run. Here are some shake-ups worth celebrating. IN RECENT YEARS, few corner offices have had doors that revolved as fast as Mattel's. The toymaker has replaced its CEO three times since 2015 - most recently last April, when former Google executive Margo Georgiadis stepped down from the post, to be replaced by Ynon Kreiz.
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