[header] How to know when to sell a stock [title] Learn the difference between market value and intrinsic value. [step] A stock essentially has two values. The market price refers to the share price you see when you go to buy or sell a stock. 
This is contrasted with the intrinsic value of the company, which is the true value of the company, independent of what people are willing to pay for it at the current time. [substeps] A stock considered overvalued when its market value exceeds its intrinsic value.