Peter Day's World of Business

Online retail spending has increased more than four fold in the last ten years - it now accounts for almost one in five pounds we spend shopping. But whilst times are tough for our high streets, e-retailing is far from a licence to print money. With widespread discounting and a growing cost of delivery and returns, margins are being squeezed and many are finding it a struggle to survive.In this programme, Adam Shaw investigates how the economics of e-commerce work, what the move to predominantly online will mean for many retailers and what our shopping environment may look like in 10 years time.Presenter: Adam Shaw Producer: Alex Lewis Editor: Penny MurphyImage: A woman packing a box to post Credit: Getty Images