[dguo]

If you asked that question to Warren Buffett, he would probably point you to Benjamin Graham's distinction between investment and speculation:

"An investment operation is one which, upon thorough analysis promises safety of principal and an adequate return. Operations not meeting these requirements are speculative."

http://buffettpedia.com/2017/08/investment-versus-speculatio...

[ram_rar]

you can analyse the hell of the stock and still be wrong. Markets can stay irrational much longer than you think!