Turn on your TV and put on your favorite news channel after a sharp move on the market, a currency pair, etc. Wait, you don’t have to go that far, just go to Bloomberg or Reuters and you’ll always see an explanation of the “sharp move” it happened because the traders and investors took profits, traders and investors digesting the new info on the global crisis, etc.
All these news sites and channels play the past prophets. This information would be useful ahead of time, unfortunately no one knows how traders and investors are going to react. This is what hits book deeps in.