During the next month, graduating law students across the country can expect to hear “career rules to live by” from commencement speakers. “Fight for justice” and “Uphold standards of professionalism” were popular when I graduated. And I would never disagree with those.

Well, here’s a career rule to live by for those newly minted lawyers who want to develop a lot of business and make a lot of money. It’s called the “five-foot rule.” It says, “Say hello to anyone standing within five feet of you.”