Because the Murrey Math rules are tied to the Murrey Math geometry, a trader can expect certain pre-defined behaviors in price movement and this makes Murrey Math lines from my own humble perspectiveis, a true and powerful leading indicator. By recognizing these behaviors, a trader has greatly improved odds of being on the correct side of a trade. The overriding principle of the Murrey Math trading system is to recognize the trend of a market, trade with the trend, and exit the trade quickly with a profit (since trends are fleeting). In short, "no one ever went broke taking a profit"
http://www.myfxbook.com/members/PTSP/murrey-math/3559227