His growing fame in financial circles also is lending Citigroup credibility as it tries to rebuild its image following the financial crisis.

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But there is another scenario that is being discussed in financial circles.

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Yet Mr Greenspan's views carry weight in financial circles.

ECONOMIST: Derivatives

Other survivors from the old commission, which was cajoled into resigning en masse in March after a report exposed cronyism and incompetence, include Mario Monti, the Italian responsible for taxation and the single market and respected in financial circles, and Erkki Liikanen, a Finnish socialist who has tried to bring some Nordic rigour to the commission's housekeeping.

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Cardinal Tarcisio Bertone, who heads the commission of cardinals overseeing the scandal-marred Institute for Religious Works, outlined the efforts to clean up the bank's image in international financial circles.

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In financial and political circles, it is regarded as a must-read title, so much so that its nickname is the "business bible".

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Many of these brokers have their own proprietary sources in legal, financial and technology circles.

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In a move that surprised government and financial circles last week, Canada's biggest bank, Royal Bank of Canada, agreed to merge with third-ranking Bank of Montreal.

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Ms. Tisch could help boost Mr. Thompson's credentials in the city's prominent real estate, business and financial circles, a crucial group for fundraising.

WSJ: Regents Chancellor to Back Thompson

Impact investing, a relatively new concept in African investment circles, typically refers to investments that aim to solve pertinent social and economic challenges while generating a financial return.

FORBES: Rockefeller And Tony Elumelu Foundation Launch African Impact Fund