McDonald's has already populated Chipotle with a chief financial officer, chief operations officer, a purchasing chief and several regional managers.

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In most households, she is now the stated or implicit Chief Executive Officer, while also serving as Chief Purchasing Officer, Chief Operating Officer and Chief Financial Officer.

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Were they fully merged--they remain distinctly separate despite sharing a chief executive and such tasks as purchasing, tech networks and some car chassis, engines and transmissions--the amalgam would be the fourth-largest carmaker on the planet.

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