Buying the dip, without catching the knife
"Buy the dip" is the oldest advice in markets — and the most dangerous when taken literally. Every stock that went to zero was, at some point, a dip. The strategy only works when you can answer one question: is this a discount or a decline?
The four checks that separate them
- Is the selloff statistically stretched? Oversold RSI, price at the lower Bollinger band, a drop that's large relative to the stock's normal volatility — these say the rubber band is pulled, not that it will snap back.
- Is the business still sound? A dip in a profitable company trading near its sector's normal valuation is a sale. A dip in a money-loser drowning in debt is a trend. This check is what "buy the dip" memes always skip.
- Why did it drop? Read the headlines. A missed quarter or an analyst downgrade is recoverable; the words fraud, bankruptcy or SEC investigation are not the kind of dip you buy.
- Is the market itself healthy? In a calm tape, individual dips revert. In a panic (VIX spiking, index below its long-term trend), everything is a falling knife.
Then: define the exit before you enter
Serious dip-buyers decide three numbers in advance: the target (where mean reversion takes you), the stop (where the thesis is wrong), and the time limit (mean reversion that hasn't happened in weeks usually isn't coming). Skill shows up in the exit, not the entry.
Practice it with a scorekeeper
CASHFY runs exactly these four checks on the entire S&P 500 every five minutes and deals the survivors as cards with target, stop and hold horizon attached. You play them with paper money, and every exit gets graded against the peak profit available. It's the fastest way to learn whether dip-buying suits you — at exactly zero cost.
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