Rule 48
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Rule 48, also known as Exemptive Relief — Extreme Market Volatility Condition,[1] was a mechanism used by the New York Stock Exchange to ease market opening while volatility is high. It may have the effect of pre-empting trading at disrupted prices,[2] as the designated market makers do not have to disseminate price indications prior to the opening bell.[3][4] It was approved in 2007 and repealed in 2016.