Stefan Walter, secretary-general of the Basel Committee on Banking Supervision, said at a summit on Basel III that although the rules' general framework is set, regulators would consider changing how liquidity ratios are calculated. Walter said banks have an opportunity to make arguments, but they must be supported with additional analysis. "We're not going to relitigate the agreement on the basis of old data -- that's been done to death," he said. "We need new analysis, new data, on the back of which there could be adjustments if we see a problem."

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