Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why do investors buy stock that had appreciated?
Imagine how foolish the people that bought Apple at $100 must have felt. It was up tenfold for the $10 it traded at just years prior, how could it go any higher?  Stocks have no memory. A stock's earnings may grow and justify the new higher price people are willing to pay. When FB came public, I remarked how I'd analyze the price and felt it was overvalued until its earnings came up. Just because it's gone down ever since, doesn't make it a buy, yet.