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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 the 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