Smart investors know that buying on the dip is a winning strategy. Stock market sell-offs are inevitable, so why not use them as an opportunity to snap up shares of excellent companies at cheap prices?

Today, let's examine two unstoppable growth stocks that investors should consider adding if there's a stock market sell-off: (NASDAQ: GOOG) (NASDAQ: GOOGL) and Visa (NYSE: V).

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Source Fool.com