WALNUT CREEK, Calif.--(BUSINESS WIRE)--Arch Mortgage Insurance Company (“Arch MI”), a leading provider of private mortgage insurance and a wholly owned subsidiary of Arch Capital Group Ltd., today released the Summer 2015 edition of its Housing and Mortgage Market Review, which contains the latest Arch MI Risk Index model results. The state- and metro-level risk indices predict the likelihood that home prices in a region will decrease over the next two years, based on recent economic and housin