It was probably speculated here before, but here it is in black and white:
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By buying the rest of Chrysler, there would be less pressure on Cerberus to offer any financial guidance to the marketplace about revenues or earnings. Because Daimler is publicly traded, the German automaker has to report the progress of its stake in Chrysler. Each quarter and at the end of the year, analysts and media are left to extrapolate those numbers for all of Chrysler.