Relative strength investing is a safe, profitable investing technique well known amongst professional investors but with little documentation. Michael Carr decided to document relative strength (RS) investing via his book "Smarter Investing in Any Economy" in 2008 and reprinted here. By applying scientific and sometimes technical methodology, Carr discusses the concepts and theories, then proceeds to test and validate different RS formulas and their results before showing how any person can use RS to manage and trade a retirement account or any stock market investments. The second part of the book illustrates how to implement relative strength investing using a software program that Carr uses today.