In the aftermath of the credit crisis, credit spreads soared to unpredicted heights. Basis spreads between three-month Libor and six-month Libor, for example, went from fractions of a basis point (where they had been quoted for decades) to double digits in a matter of months. Practitioners had to revise valuation methodologies to reflect these changes in the market. The accounting profession is now recognizing that these new market practices have important accounting implications as well.