We all hate to feel that someone has an unfair advantage over us. But how do we feel when the advantage is ours? Do we exploit it, hoping no-one will notice? Or do we feel overwhelmed by a sense of conscience and the feeling that, somehow, our gains will be ill-gotten and we’ll surely pay a penalty? It’s never good to fight fire with fire. Or to stoop to low behaviour, just because somebody else is behaving without integrity.