In our main-case forecast scenario, economic conditions are set to continue roughly as they are, with high levels of employment and capacity utilisation but slow growth as businesses refrain from investment in view of continuing high uncertainty about future trading relations. CPI inflation would continue to be close to target.
In an alternative orderly no-deal scenario, we would expect GDP growth to fall to zero in 2020 and CPI inflation to rise above 4 per cent in response to a lower exchange rate and accommodative monetary policy. Fiscal policy measures may be required to help smooth the adjustment to a no-deal Brexit though, as shown in Box C, they would be unlikely to have a large macroeconomic effect.
We see the risks to growth to be heavily weighted to the downside in view of the high probability of a no-deal Brexit and the risk that this could be disorderly. Given the slow underlying growth rate of the UK economy, the fragility of the global economy, and the significant risk of an abrupt downward shift at the end of this year, we judge that there is around a 30 per cent chance of output growth of less than zero per cent in 2020.