As travel comparison sites have proliferated on the Web in the last decade, so have the ranks of those who use them. “Shopping around is a very common behavior with travelers now,” said Tom Meyers, the editor of EuroCheapo.com, a Web site that reviews and books hotels in Europe. “It’s almost a game. They book the room and then wait awhile and search around to see if prices have gone down.” Chris Anderson, a professor at Cornell University’s School of Hotel Administration, studies hotel revenue management and pricing, and estimates that 20 percent of hotel reservations experience a price decline after the guest books the room and by the time the guest arrives. The average price drop of 10 percent leads to a net revenue decrease of 2 percent. Get the full story at The New York Times