Once more, dip buyers can be stung if another U.S. market rally fails.

A sobering lesson for investors is being hammered home by Friday's plunge in U.S. stocks

while buying dips has been successful over the last ten years, it hasn't worked this year.

The S&P 500 has.rebounded.by at least 6% four times this year, only to turn around and hit new lows

This week's rapid rise in U.S. equities may be in tor a repetition.

"There were probably some individuals hoping for a poorer result that may pave the way for a Fed reversal.

As a senior global market strategist at the Wells Fargo Investment Institute, Sameer Samana remarked, "I'm sure they were dissatisfied.