Gerrit: While browsing in a record store I noticed that one copy of a recording I wanted had mistakenly been priced at a quarter of the list price  When I finally reached the cashier I was told that the price had been mismarked and I would have to pay the full list price  Since I had wasted an hour standing in line, the retailer was morally obligated to sell me the recording at the lower price  Saskia: I disagree
You knew that a mistake had been made, and you were simply trying to take advantage of that mistake
Customers of retail stores are morally entitled to profit from any mistakes that the retailers make in marking prices.