While it’s a cute saying, and helps the DCA investor sleep at night, it’s not true that you have to buy at the lowest point and sell at the highest, which IS virtually impossible.
BUT
A $100 stock is on its way down to who knows where, but I have a 10% stop loss on it, so it sells at $90.
I don’t have to buy it back at the low of, say $65, to come out ahead, but if I do see it down there, but coming back UP and buy it at $75 or $80, I’ve already made serious money by the time it gets back to my “sell” price of $90, let alone my “buy and hold” $100!
The “mistake” is selling it on the way down at $90 and then buying it back on its way back up ABOVE $90! That’s the time when “buy and hold” has worked for you.
Here’s another cute one for you:
If you don’t buy and hold, and instead like to trade in and out by timing the market, you have be right twice to come out ahead…once when you time the sell, and once when you time the buy!