Looks like the law of supply and demand is at work in Brooklyn. According to a market trend report from Trulia, the average listing price of Brooklyn homes rose 1.4% between September 24 and October 1, from $691,857 to $701,779. The number of listings, however, went down from about 4,725 to about 4,625. Think folks are holding off releasing units until the credit crisis wanes? We thought prices were starting to come down…