In the early days of the Internet, some writers predicted that it would bring about a "frictionless economy" – one where shopping for, buying, and even delivering purchases, would happen entirely online. In the years since, the successes of online businesses from eBay to Amazon have made a lot of this image a reality, but online commerce is far from frictionless: scams, frauds, excessive spending and shoddy or misrepresented goods all lie in wait for the unwary buyer.