The global economy expanded by 5.3 per cent in 2006, one of the fastest rates of growth in the past 35 years. We project further expansions of 5 per cent this year and 4¾ per cent in 2008. The key risks to the forecast that we highlight in this Review relate to global housing markets and the current stance of monetary policy. The US economy is restrained by the recent correction in its housing market, which is expected to continue to weigh on the economy through 2008. There is some concern that the housing investment downturn may spread to other economies, and in this report we explore the areas most at risk to such a contagion. We also consider the recent volatility in the oil price, which makes it difficult for monetary authorities to distinguish signal from noise. If too much emphasis is placed on what subsequently turns out to be noise, policy settings could turn out to be overly lax or stringent.