Sorry, was dealing with an insurance adjuster, so could only give cryptic answer. I use breadth as a peek below the hood of the market. It can provide a view into the underlying strength or weakness of a move, but it is secondary to price. Still, when there is a gap down like this morning with positive breadth, it can cast some doubt on the amount of follow-through to be expected. The bottom panel is where you can see the conviction of a move. 2:1 or 3:1 ratios are fair. Ratios of 5:1 to 8 or 9:1 show strong conviction