Here’s Why “Buy and Hold”
An argument in favor of buy-and-holding (investing for the long-term):
If you remove the 10 ten biggest one-day moves for the U.S. Stock market over the past 50 years, your returns are cut in half. Half the gains in the stock market are directly due to events that the mathematical models we rely on assume will never happen.
Edited to add (see comments for more info and source):
“…by missing the 10 worst days along with missing the 10 best days increased your terminal worth by 200%. Missing the worst 100 days & 100 best days increased your terminal wealth by an astounding 40,000+%”