An update to the Elliot Wave Principle that corrects a fundamental error The Elliot Wave Principle has been widely adopted as a tool for traders analyzing market cycles, but Ian Copsey has unearthed a fundamental error in the way it defines the structural development of price behavior. Harmonic Elliott Wave: The Case for Modification of R. N. Elliott's Impulsive Wave Structure explains what's wrong with the Principle, outlining a modification that allows for more accurate trading predictions. Revealing the methodology that led to this discovery, the common ratios that link different parts of the wave structure, and providing a wealth of practical examples to explain his findings, Copsey shows how waves really develop, dispelling the misconceptions that have been practiced by Elliotticians for years. Supporting his methods by consistently ensuring that waves are related by common ratios, Copsey helps the reader apply the revised version of the Principle with greater understanding and accuracy. Reveals a fundamental error in the popular Elliot Wave Principle Outlines a tried and tested modification that fixes this mistake and allows for more accurate analysis Offers essential information on applying the new model to the markets With far-reaching implications for traders everywhere, Harmonic Elliott Wave is a must-read for anyone who puts their faith in the Elliot Wave Principle.