There’s a selfish little consumer behaviour researchers have finally given a name to. Tell me if you’ve experienced something like this. Near where I live, there’s a new Mexican restaurant with fantastic food and almost absurdly good value. I occasionally write restaurant reviews, so normally I’d be happy to tell people about it. Except I caught myself thinking: maybe I shouldn’t. What if it gets crowded, and then the prices shoot up? What if my family can’t waltz in and get a table anymore?...