Ingvar Kamprad loved mistakes, as long as you learnt something and didn’t make them again. “It must be allowed to make mistakes. It is always the mediocre people who are negative, who spend their time proving that they were not wrong,” he wrote in The Testament of a Furniture Dealer in 1976. The way Ingvar saw it, the fear of making mistakes was “the enemy of development” and “the root of bureaucracy”.