Answer:
10%
Step-by-step explanation:
As a result of flash crashes, the SEC is trying circuit breakers that will halt trading for 5 minutes if large stocks' prices change by more than 10% in a 5-minute period
Circuit breakers can also be imposed on single stocks as opposed to the whole market.
The now current rules, a trading halt on an individual security is placed into effect if there is a 10% change in value of a security that is a member of the S&P 500 Index,