U.S. holiday sales could rise over 10 percent this year, a trade body said on Wednesday, as major consumer goods makers and retailers work to prevent supply chain disruptions from leaving shelves empty of in-demand toys and games. The National Retail Federation (NRF) forecast sales to increase between 8.5 percent and 10.5 percent, to between $843.4 billion and $859 billion, during November and December, compared with a previous high of $777.3 billion last year. The numbers exclude automobile dealers, gasoline stations, and restaurants. Rising income and stronger-than-ever household savings would help people pay more for goods when companies are raising prices to counter inflation, NRF said. It added there is exceptional demand for holiday products, although a survey last week highlighted customers’ worry about availability. “If retailers can keep merchandise on the shelves and merchandise arrives before Christmas, it could be a stellar holiday sales season,” NRF Chief Economist Jack …