Typically it's when the average closes below the 20% mark.
For the Dow, a close below 23,640 would do it. We're several hundred points below this mark in the final hour of trading.
On the S&P, the close would need to be below 2,708... we're trading right on this level now.
For the Dow, a close below 23,640 would do it. We're several hundred points below this mark in the final hour of trading.
On the S&P, the close would need to be below 2,708... we're trading right on this level now.