When Fuat Ecer decided to go back to school for an M.B.A. after three and a half years working as a consultant, he wanted to be certain to find the best school in which to invest his time, money and future.

“What kind of door-opener do you need?” wondered Mr. Ecer, a 31-year-old German businessman, who sought the school that would best help him find employment in a top global company, even during an economic downturn.

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