The nation's stock exchanges and the Financial Industry Regulatory Authority are filing proposals that will trigger halts in trading, marketwide, more quickly, the Securities and Exchange Commission said. The changes are proposed for marketwide "circuit breakers," which key off drops in the Dow Jones Industrial Average.

The revisions, which among other things cut down the size of the drop that would trigger a circuit breaker by a third, are designed to address extraordinary volatility across the securities markets.

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