Some investing decisions are easier than others. A high-growth stock with increasing profits at a low valuation could be a no-brainer buy. But if you take out the low valuation, it could become a real question. Similarly, investors might struggle to determine if a young, high-growth stock with an uncertain future is a better buy than a mature, lower-growth one that's well-established.

For most investors, the way to deal with the conundrum is actually quite simple. It's called diversification. Instead of choosing from these different types of stocks, buy both, and add a few more to round out your holdings. A solid group of stock picks should include proven, established winners that still have strong growth prospects.

One excellent example today is Amazon (NASDAQ: AMZN). If you weren't sure whether or not the e-commerce giant still has more growth ahead, consider what CEO Andy Jassy just said.

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Source Fool.com