Heard of any deals lately that combine a bank, an insurance company, and a brokerage under one roof? The silence since the 1998 Citicorp-Travelers merger has been deafening. It took an act of Congress to keep the megamerger that created Citigroup intact. But now that Congress has repealed Depression-era laws that held banks, brokerages, and insurance companies apart, these companies have more freedom to tie all sorts of complicated knots.

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