On today's ST, a detailed discussion of the currency problems affecting certain European countries --- namely, Greece, Spain, Portugal, and Ireland. We welcome to our show Dr. Stanley Black of the University of North Carolina, Chapel Hill. He's a highly respected economics professor who's also taught courses at Princeton, Vanderbilt, Yale, the Institute of International Economics in Stockholm, the University of Siena in Italy, the Brookings Institution, the International Monetary Fund, and the Free University in Berlin.