And Maha Al-Ghunaim (No. 94) is the cofounder and chair of Kuwaiti bank Global Investment House, one of the largest banks in the area.

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Faisal Hasan, head of research at Global Investment House, a Kuwait investment bank, says room rates have gone up at the best hotels in the Gulf and Middle East.

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Now it has transformed itself through organic growth from a narrow bond house into a broadly based global investment bank.

ECONOMIST: Investment-bank mergers