I was in a lecture of Bruno Dupire's when he said something along the lines of a linear hedge being sufficient for most purposes. He gave a counter example as well: a corporation producing something and multiple currencies, but it went over my head at the time. (I wish I had taken notes)
So my question is: is it true that a linear hedge is sufficient for most clients, ie. there is no inherent need for derivatives (except futures/swaps)? If so, where can I read more about this and see a possible counter example?