Like many of us, I sometimes overuse the word “need.” I have a tendency to say that I need the new iPhone or I need a pedicure, even though those are clearly things that I want, rather than need. My greatest lesson on distinguishing between a want and a need came with my first-grade class when I was a new teacher. Volunteers from the business community came to teach for a day through the Junior Achievement program. As a new teacher, I was overwhelmed and relieved not to be responsible for lesson plans for the day. I was nervous, however, about how an idealistic businessperson would deal with 20 extremely needy first-graders living in one of the most violent parts of Oakland, Calif.