Knowledge bank: Huge sporting events are a break from every day life.
But they are expensive. Event organisers understimate the costs and exaggerate the revenues for the event and for the host country, says Harry Arne Solberg of the Trondheim School of Business.

Knowledge bank: Declan Hill explains why the Russian mafia is attracted to hockey both in the former Soviet Union and abroad. He shows how organised crime figures deliberately targeted some of the top hockey players in the NHL and were able to socialise with them, to extort them, and in some cases to actually go into business with them.