https://www.elliottwave.com/Free-Reports/Introduction-to-the-Wave...

https://www.elliottwave.com/Free-Reports/Introduction-to-the-Wave-Principle

The story of Ralph Nelson Elliott. An incredible body of work showing how investor psychology ebbs and flows to form waves. What we now call fear and greed. To do the research(in the 1930's) into this and see the correlation going back centuries, before computers or charting as we know it now, was revolutionary.
There has been discussion around chartists influencing markets which may be possible on a very short term time frame but is impossible over longer term. Elliot wave theory actually proves that it is human behaviour and psychology that drives markets in the long term and has done so for centuries. While the theory works best for major indexes and major companies best it can work for any assets.