The notion of “dynamic pricing” has long been familiar to anyone booking a train ticket, a hotel room or holiday (Expedia might offer thousands of price changes for an overnight stay in a particular location in a single day). We are used to prices fluctuating hour by hour, apparently according to availability. Uber, meanwhile, has introduced – and been criticised for – “surge pricing”, making rapid adjustments to the fares on its platform in response to changes in demand. During the recent tube strikes in London, prices for cab journeys ‘automatically” leapt 400%. (The company argued that by raising fares it was able to encourage more taxi drivers to take to the streets during busy times, helping the consumer.) What we are less aware of is the way that both principles have also invaded all aspects of online retailing. Get the full story at The Guardian