Nine Time-Tested Businesses That Rake It In
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Wired Telecommunications
Average Pretax Profit Margin: 12.6%
Keeping the world connected is no mean feat, and the tasks performed by this hodgepodge of service providers run the gamut--from fortifying firewalls to helping large corporations set up and maintain phone lines. While the barriers to entry are relatively low, satisfied customers tend to keep coming back, reducing acquisition costs.
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