"This Element is an excerpt from Technical analysis plain and simple: charting the markets in your language, third edition (ISBN: 9780137042012) by Michael N. Kahn. Usually, certain sectors of the market are leading the charge while others are lagging. This means you need to know which sectors of the market are going to lead and which will lag. Once you know that, picking stocks from the leaders is a lot less risky"--Resource description page.