Think Europe's Stable? Portugal Sure Isn't

Itâ??s been a volatile few weeks for yields on Portuguese 10-year bonds (essentially the interest rate the Portuguese government would have to pay if it borrowed money for 10 years). Today, they plunged dramatically, hitting 6.5%, from 6.99% on July 19. Thatâ??s after nearing 8% on July 3, and again on July 12.