Buy MBIA (MBI), Assured Guaranty (AGO), and Ambac (AMBC) on any weakness arising from the Detroit bankruptcy, writes Mark Palmer. The municipal insurers' exposure to the city is well-documented and quite manageable. What about the domino effect? Find another city with a 63% decline in population, 78K abandoned buildings , 66K vacant lots, violent crime 5x the national average, and a tripling in unemployment since 2000 and then we'll talk, says Palmer. MBI -1.5% premarket.