Royal Bank of Scotland Group PLC's chief executive officer, Stephen Hester, said Tuesday that while he believes the path of regulatory change in the banking system will be "phased and sensible," the chances are slim that a global agreement will be reached.

"The speed of implementation and the totality of calibration [of the changes] have still got some extreme ends within it, and the ability to get a global agreement is probably very close to zero," Hester told investors at a presentation in New York.

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