The new Citigroup, formed by the merger of Citicorp and Travelers Group, will join a rare breed of company - those with two chiefs.

In unveiling their $70 billion combination in April, Citicorp's John S. Reed and Travelers' Sanford I. Weill said they would share the top job. That announcement has added fire to the debate on whether any company can be effectively led by two strong-willed and high-profile chief executives.

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