Borrowing costs for Europe’s most indebted nations are at record highs as Ireland’s capitulation in accepting a bailout of its banking industry stokes concern that other countries also will have to seek aid.

The average yield for 10-year debt from Greece, Ireland, Portugal, Spain and Italy reached 7.57 percent today, a euro- era record. The average premium investors demand to hold those securities instead of German bunds widened to as much as 492 basis points, the highest level of 2010. The average cost of insuring against default by the five nations using credit- default swaps reached a record 517 basis points on Nov. 23.

‘It’s no longer taboo to speak about a restructuring,