The miracle of pricing is that it enables individuals to be part of a world-wide supply chain, each prospering by doing their bit without any need to control the work of others. It is, in effect, a brilliantly efficient way of transmitting information. For those of us in business, the setting of prices is a major function. In some businesses, prices are set and remain constant for long periods. In others, such as grocery or airlines, prices are in a constant state of flux. Be