(AJC) — Home prices are dropping in the nation’s largest cities and are expected to keep falling next year, as fewer people purchase homes and millions of foreclosures come on to the market. The Standard & Poor’s/Case-Shiller 20-city home price index released Tuesday fell 1.3 percent in October from September. All cities recorded monthly price declines. The last time that happened was in Feb. 2009. Atlanta recorded the largest decline. Prices there fell 2.9 percent from a month earlier. Home prices in Washington dropped 0.2 percent in October, the second monthly decline after five straight increases.