David Tepper warned in early february 2020 that covid was a potential "game changer." just a few weeks later, the markets crashed and most global stocks got wiped outthis is exactly when his main rule applies:"this company looks cheap, that company looks cheap, but the overall economy could completely screw it up. the key is to wait. sometimes the hardest thing to do is to do nothing."a lot of traders blew up their accounts in march 2020 just because they bought the very first dip. they saw a 10