The tough part about investing is that we are trying to make informed decisions based on things that have yet to happen. It’s important to keep in mind that even though we use past data as an indication of things to come, it’s what happens in the future that matters most.
A quote from Peter Lynch’s book “One Up on Wall Street” (1990) about his experience with Subaru demonstrates this: “If I’d bothered to ask myself, ‘How can this stock go any higher?’ I would have never bought Subaru after it already went up twentyfold. But I checked the fundamentals, realized that Subaru was still cheap, bought the stock, and made sevenfold after that.” The point is to base a decision on future potential rather than on what has already happened in the past. (For more insight, see The Value Investor’s Handbook.)