Many investors have probably heard the expression: "Be fearful when others are greedy. Be greedy when others are fearful." It means that you should buy stocks based on logic, not emotions. But following its direction is not as easy as it seems. Watching the daily ups and downs of the stock market, it's clear that a lot of investors are highly irrational. The problem is, investing based on impulses usually backfires.

Letting emotions impact investing decisions is a common mistake. What's the solution? One option is to consider dollar-cost averaging, or buying a little of a stock at a time. Investing based on a system can help prevent these emotional urges.

Of course, even with dollar-cost averaging, you want to accumulate the right stocks. Here are three stocks that are so good you can slowly pick up shares regardless of what the market is doing and expect a decent return over the long term.

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Source Fool.com