A lower-class child knows subtraction and an ocean dive is yet left for you to know what the 4 words mean. For you to buy low and sell high the first question should be what is high and what is low? A value should be set for you to know what the tape is really worth. How can you buy a phone with no price tag? Intrinsic value is a number that tells you at what price the business is admirable. 

Buy low, sell high.