People find it simpler than making a return or they have missed the returns window.
More than half of shoppers have opted to re-sell unwanted purchases themselves - rather than returning them to the store.
A survey by a credit card provider in the UK suggests the top reasons for reselling include people finding it simpler than making a return or missing the returns window.
A survey of 400 retailers also found 56% reported a drop in return rates in the past year.