The world's changed a lot in the last 20 years, and that's certainly true of the business world.

Once upon a time, the American economy was dominated by banks, oil companies, and manufacturers. These days, the tech sector reigns supreme, as the "Magnificent Seven" makes clear.

However, it can be informative to take a ride in the wayback machine and see what's changed. Doing so is a reminder that nothing lasts forever in business and it's a useful way of studying what worked and what hasn't.

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Source Fool.com