Investing legend Peter Lynch once said, "The best stock to buy is the one you already own." I believe he said this because if you buy stock in great companies in the first place, these will likely still be great companies at a later date. Therefore, buying more of these stocks makes a lot of sense. But are there more-specific reasons to buy stocks that are already in your portfolio?

In this video from Motley Fool Live, recorded on June 30, Motley Fool contributors Jon Quast and Brian Withers talk with longtime Fool Anand Chokkavelu about stocks they've recently bought more of. In some cases, investors pre-determine to dollar-cost average their positions over time. In other cases, investors buy more of a stock as their conviction in the company grows.

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Source Fool.com