Abandoned, but why?

A DoubleClick study showed that the share of shoppers on e-commerce sites who actually buy something went up about 15 percent, to one in every 25 visitors. $5 dollars was left abandoned in shopping carts for every $1 purchased. But that kind of aggregated data brings only limited insight, as shopping cart abandonments are often misinterpreted. Just because people add something to a cart doesn't mean they really have purchase intent.