In this video, Matt Koppenheffer talks about what he sees as the single biggest risk to AIG (AIG 1.10%), namely its poor quality businesses. Over the past few years, AIG has sold off businesses, rebuilt its balance sheet and streamlined its business. However, its current stable of life and property insurance businesses are less than inspiring. The property insurance business has not been underwriting profitably, and the life insurance businesses have faced pressure on their profits. If you want to invest in an insurance company, you want to see profitable underwriting, and right now, AIG looks a little shaky in that regard.