Buying and Holding markets are key because if all the sudden a bull market turns into a bear market you can not panic. Because if you calm down and hold your stocks the bear market will eventually pass by and turn into a bull market allowing for you to sell for most likely a gain. But if you don't hold and the bear market turns out to be a shorter period of time that expected than you just got huge loses for a stock or fund that you could of had a gain on. So Buying and Holding is a better market strategy unless your new to the market or like 30 because you will still have 50-60 more years to invest.