Over the last few days I’ve noticed one significant thing. Creeping yields on U.S. commercial paper. Prior to the financial crisis in 2008, rising yields on commercial paper were one of the first signs of trouble in the credit markets. Holders sold off paper to reduce their exposure to troubled businesses. As prices for commercial paper dropped, yields spiked. Over the last year, yields have declined as buyers returned to the market. Everything seemed to be good again. But there has been a notable rise in yields on longer-dated paper over the last month. Yields on 90 Day AA Financial...