Nike has its “Just Do It” slogan, Burger King’s “Have It Your Way” has sold a lot of hamburgers; likewise, KFC’s “Finger Lickin Good” is iconic, and most of you may be familiar with United’s “Fly the Friendly Skies.” To those classics, perhaps someday you’ll connect with “Mo’s Bros” lawn care, Clyde’s Donuts “Glazed to Amaze,” and Doggy Yard Care’s slogan “We Scoop Your Poop.” If your teen is entering the service economy this summer and starting a business, don’t overlook the importance of...