The goal of investing is to sell something at a price that's higher than what the investor paid to buy it. The problem investors face is determining when prices are low enough to indicate a buy and high enough to decide that selling is the best choice. Relative strength addresses this problem by quantifying how a stock is performing compared to other stocks.  Today Steve and Sinclair explore and define relative strength investing, and how it made fortunes for the likes of Jesse Livermore, who shorted the 1929 stock market,netting a cool $100 million ($1.3 billion in today's dollars.)