A term used by The Dow Theory author, Robert Rhea, to describe the day-to-day fluctuations in stock market prices. Rhea wrote that three simultaneous movements of stock prices occur that can be compared to tides, waves, and ripples. Rhea's book, The Dow Theory, published in 1932, suggested that speculators attempt to ride the tides and the occasional big waves, and that only reckless investors would ever attempt to profit from day-to-day price ripples. 


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