For years I’ve shopped in two neighborhood supermarkets – Gristedes and Key Food – both a few blocks from my apartment and across the street from each other. Although New York is often thought of as an unfriendly place where people live in isolation and anonymity, we New Yorkers know that’s simply not true. For most of us our neighborhoods are like small towns, and we know our neighbors, our postmen, our local merchants – and certainly the managers of our...