BE PERSISTENT AND WORK HARD Become The One To Beat.(LEADERS & SUCCESS)(IBD'S 10 SECRETS TO SUCCESS)

Byline: Cord Cooper

5 If you'd like a lesson in determination, look no further than Stampp Corbin, founder and chief executive of RetroBox.

His firm helps clients sell, redeploy or charitably donate used high-tech equipment. It's a profitable niche, and it's attracting a slew of mom-and-pop copycats. But Corbin remains a segment leader, he says, by outdoing rivals on service and reliability.

Here's how the business works:

When companies upgrade technology or do mergers and acquisitions, they're often stuck with a ton of unneeded equipment. Many of them turn to RetroBox, which picks the equipment up, transports it to one of two …