Information about future demand and supply levels ought to be reflected in the current price and in the prices of commodity futures. But the increases from Autumn 2010 onwards were largely unexpected, and have been a genuine surprise for our forecasts. For example, spot oil and gas prices have risen very substantially since their low points in 2009.2 Spot oil prices are well above the levels implied by futures prices at the time of the February Inflation Report (Chart 2). Gas futures prices have also moved markedly higher since then (Chart 3). Chart 2  Chart 3  Sterling oil prices(a)  Sterling gas prices(a)  Sources: Bloomberg, Thomson Reuters Datastream and Bank calculations. Sources: Bloomberg, Thomson Reuters Datastream and Bank calculations. (a) Futures prices for February and May are averages during the fifteen working days to 9 February and 4 May respectively. Each futures curve assumes that the sterling-dollar exchange rate remains constant at its average during those periods. (a) Futures prices for February and May are averages during the fifteen working days to 9 February and 4 May respectively. (b) One-day forward price of UK natural gas. (b) Brent forward prices for delivery in 10–21 days’ time converted into sterling. Third, we have been experiencing the ongoing effects of sterling’s fall during 2007 and 2008, when the nominal effective exchange rate fell by around 25% (Chart 4).
7  For more information, see Britton, E, Fisher P, and Whitley J, “The Inflation Report projections: understanding the fan chart”, Bank of England Quarterly Bulletin, February 1998, pages 30–37. 6  BIS central bankers’ speeches