The S&P 500 just keeps falling, but the selloff still has a long way to go before it triggers the New York Stock Exchange’s market-wide circuit breakers. The S&P 500 was down 2.3% in Tuesday morning trading, which put the index on track for its largest daily decline since Oct. 10, according to Dow Jones Market Data. If trading resumes and the index falls 13% before 3:25 p.m. ET, a level two circuit breaker triggers another 15 minute halt.