Apple (NASDAQ: AAPL) needs little introduction.

The iPhone maker has built an unrivaled consumer tech ecosystem, selling high-priced devices and related high-margin services like the App Store and Apple Pay. Its business model and reputation for quality products have allowed Apple to generate enormous profits and made it the most valuable company in the world, with a market cap today of about $2.9 trillion. With modest growth, the company could be worth $5 trillion by 2030.

However, just because Apple is the most valuable company in the world today doesn't mean it will always be. Just ask ExxonMobil, General Electric, and IBM, all of which have fallen sharply from their earlier positions as the most valuable companies in the country.

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Source Fool.com