NEW YORK ( TheStreet) -- Beauty is in the eye of the beholder. In the stock market, the term "value" is one of the words that essentially models that same description -- that is to say, it depends on who is doing the judging.A glass of water might conjure a host of different meanings from half-full to half-empty or even the idea that it might be time to short water and go long on glassware. Still, the reality is that which makes up valuation is all relative. In this article, we are going to discuss a few stocks that are constantly in the forefront of the valuation discussion and try to answer the prevailing question of whether or not stocks always reflect a company's underlying value. We are going to look at four names: Apple ( AAPL), Facebook ( FB), Amazon ( AMZN) and Salesforce.com ( CRM). We will try to determine the source of the mistake that investors continue to make -- confusing "price" with "value," two entirely separate things.