Bond yields have fallen this year, but they began to rebound in the United States in the latest week as the glass-half-empty bond market realized the all-time high stock market may have it right. But this was not the case in most of Europe. The ongoing decline in European government bond yields continued last week and is striking when considering how fast they were rising two years ago. What a difference a couple of years can make. The 10-year Italian and Spanish bond yields dropped to near all-time lows at the end of last week, while Greece’s 10-year — once over 35% — fell below 7%. Problem solved? Not exactly.