Momentum in the housing market over the spring and summer may be slowing, as evidenced by two price indexes released Tuesday. The Standard & Poor's/Case-Shiller home price index was nearly flat, rising just 0.3% between August and September. Nine of the 20 cities in the index saw prices decline. "There is no clear, easy way out for housing," said John Silvia, chief economist at Wells Fargo. "Contrary to my hopes, housing prices and the housing market in general will weaken again."