Breadth behind the most recent advance was quite strong as the AD Lines for the S&P 500, S&P 1500 and Nasdaq 100 recorded new highs. Of these three, notice that the S&P 500 AD Line held its August low and the Nasdaq 100 AD Line held above its August lows. These two clearly held up the best during the October decline. The AD Lines for the S&P MidCap 400 and the S&P Small-Cap…