Markets oscillate, they don’t go in a straight line. Novice investors often don’t realize that. When I speak at a conference, and for example I am bullish on the stock market, an investor will come up and say, “But you’re wrong because the stock market was down the past two days.”
Such an investor should buy US Treasuries and go golfing.
Oscillations and waves occur everywhere in the universe. Did you hear about the recent discovery of “gravity waves” the existence of which was predicted by Einstein? Finally they have instrument to prove their existence.