Mind Your Pricing Cues, Harvard Business Review
For most items that they buy, consumers don't have an accurate sense of what the price should be. This article reviews several common pricing cues that retailers use - "sale" signs, prices that end in 9, signpost items, and price matching guarantees. The authors also offers some findings about how - and how well - these cues work.
Eric T. Anderson, Duncan Simester
Anderson, T. Eric, and Duncan Simester. 2003. Mind Your Pricing Cues. Harvard Business Review. 81(9): 96-103.