WASHINGTON (AP) — U.S. home prices increased at the fastest pace in seven years in January as the pandemic has fueled demand for single-family houses even as the supply for such homes shrinks. The S&P CoreLogic Case-Shiller 20-city home price index rose 11.1% in January from a year earlier. That’s the biggest gain since March 2014. Prices rose in all 20 cities, and the 12-month increase was larger in January for all cities than in the previous month.