Home Prices in 20 U.S. Cities Rose Less Than Forecast in May

``Home prices "are not looking quite as strong as they looked over the last year," economist and Nobel laureate Robert Shiller said in an interview on Bloomberg Television. "People should be buying a house if they want a house and not speculating that these price increases will continue," he said, emphasizing that house price appreciation has averaged less than 1 percent a year over the past century.''