Our man Bernhard von Stengel has been in the news again recently, using his expertise in game theory in order to give some useful advice on how to shop. He appeared on BBC Radio 4’s PM programme because the consumer group Which? has been attacking some of the leading supermarkets over the confusing and sometimes misleading ways in which they run multi-buy schemes and other offers. Approximately 40% of groceries are sold on promotional offers of one kind or another. While there are many good deals available, one should be careful not to fall into the traps that supermarkets may set for consumers. You can hear Bernhard’s advice here (in the interview he suggests that he is happy to do your shopping for you, should you ask, but he has since retracted that offer!).