The S&P CoreLogic Case-Shiller home price index rose 13 percent in August compared with one year earlier. The increase was slower than the previous month’s 15.6 percent rise. Each of the 20 cities tracked reported lower home price gains in August compared with July. The deceleration is consistent with other home prices indices that show prices have softened as the housing market adjusts to a higher interest rate environment and lower demand from homebuyers.