We saw that impact on a few of the big banks earlier this year. In the securitised markets, the pace can look slower to begin with but then comes in a rush. Chart 7 shows the spreads on different tranches of the ABX index, the main benchmark index for sub prime securities. What is remarkable here first is how slow the spreads were to move at all. Of course, the predicted losses on particular tranches do no move smoothly with rising defaults, but throughout 2006 the economic press was a buzz with worry about the US housing  1  In particular, the High-grade Structured Credit Enhanced Leverage Fund and the Higfh-grade Structured Credit Fund both managed by Bear Stearns Asset Management (BSAM). BIS Review 84/2007  3  market; sentiment changed several times on whether the housing downturn would lead to a general recession. Throughout this period the originators continued to write new sub prime loans and the prices of the ABX scarcely quivered. But since January the story has been quite different with two dramatic hikes in the spreads first of BBB and then of the A-rated index. In total, the spread for BBB has gone from 500 basis points at the turn of the year to over 3000 basis points. Each of these steps has left casualties.
My argument is that the uncertainties today are a return to normality after two years of exceptional predictability in monetary policy both in the UK and elsewhere. A particular area of uncertainty at present is in the credit markets. The dangers of combining a traditional credit cycle with the new derivatives markets have emerged in the US sub prime sector. The US housing market is in its downswing and there are some signs that the same is true in the UK of unsecured credit and commercial property. The position of the bigger UK sectors is less clear cut. The shift in pension fund priorities and the growth of sovereign wealth funds are further clouding the picture. It is our job on the MPC to work through these issues and reach a judgement on them. Our target is to reduce inflation to 2% and keep it there. I can assure you that we will do whatever is needed to achieve that.