Richard Wyckoff in his last sessions as an educator of stock market tape reading would say to his students. .."watch the waves [meaning of price and volume]"...
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Richard Wyckoff would use Point n Figure (PnF) with volume notations to determine price and volume wave strengths in the stock ticker tape.
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Investing Quote...
..."Losing money is the least of my troubles. A loss never troubles me after I take it. I forget it overnight. But being wrong - not taking the loss - that is what does the damage to the pocket book and to the soul."... ~ Jesse Livermore