Albert Einstein once said, "Compound interest is the eighth wonder of the world." Compound interest, of course, being the ability to earn interest on your investment, then reinvest that interest at the same rate of return. Given a long enough time period, compounding can lead to absolutely massive gains.

For a stock, if a company can reinvest its earnings at a similar high rate of return, that can lead to likewise jaw-dropping outperformance. This of course is the strategy touted by Warren Buffett and especially his late partner, Charlie Munger.

But as the miracle of compounding only works over time, that's why it's so important to buy stocks with long-term staying power. Perusing Buffett's current Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) portfolio, here are two current holdings primed for strong long-term compounding and stockholder returns.

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Source Fool.com