Making long-term predictions is difficult. Who would have guessed 10 years ago that Nvidia would be one of the largest companies by market cap in the world? Very few.

Despite this uncertain future, I still believe it is useful for investors to look out five to 10 years and think about what companies could be much larger than they are today. Otherwise, you are just making shots in the dark and should probably buy index funds instead.

While not a certainty, I think "Magnificent Seven" giants Amazon (NASDAQ: AMZN) and (NASDAQ: GOOG) (NASDAQ: GOOGL) will be the two largest companies in the world by 2030. Here's why.

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Source Fool.com