In response to a New York City investigation into pricing at Whole Foods Market Inc. , co-CEOs Jon Mackey and Walter Robb admitted last week that the company had incorrectly charged customers for pre-packaged food sold by weight. The admission came in the form of a video posted to YouTube that featured Mackey and Robb standing in a produce section, explaining their company's transgressions, but insisting that any errors were unintentional.