Tom DeMark, founder and chief executive officer at DeMark Analytics , explains the technical reasons why he sees the S&P 500 near a market top. He speaks with Bloomberg ’s Alix Steel on "Bloomberg Daybreak: Americas." (Source: Bloomberg ) You must use Trend Lines to Predict Stock Price : Tom DeMark a little more discussion here on the TD lines themselves and then then I'll refer to the charts because what the charts are going to do is going to take the lines they're going to draw the lines for me at the same time they're gonna may spray price projections and me didn't want to confuse you with lines appearing on the chart without me taking you down that road first so you know what what I'm trying to accomplish now what I showed you before was a series of lower prices and I identified TD level 1 point now here is a series of three of them and assume this is our current D now obviously I don't consider this one because I'm not a part of t