Bloody hell indeed. So the OBR is not fit for purpose but after 15 years there appears to be no push to replace it.
I hate using AI for an overview but in true
BKB fashion the below shows how he chooses to cherry pick to back up his view. It's not perfect but it's better than previous methods and better than many of its' peers.
The accuracy of OBR forecasts is a mixed picture: they are considered generally accurate compared to previous Treasury forecasts and perform well against European averages for GDP growth, but they have persistently overestimated productivity growth and their medium-to-long-term accuracy is limited by their reliance on assumptions and the exclusion of future policy changes. Overall, forecasts are best seen as informed snapshots rather than precise guarantees.
Where OBR forecasts are considered accurate
- GDP growth:
The OBR's forecasts for real GDP growth are more accurate than the European average for one, two, and three years ahead.
- Comparison to Treasury:
The OBR's forecasts for GDP and the public finances have typically been more accurate than previous forecasts made by the Treasury.
- Short-term inflation:
One-year ahead forecasts for CPI inflation have, on average, been in line with outturns.
Areas where OBR forecasts are less accurate
- Productivity growth:
The OBR has persistently overestimated productivity growth since 2010.
- Medium-term inflation:
Two- and five-year ahead forecasts have, on average, underestimated inflation.
- Long-term forecasts:
The accuracy of medium- to long-term forecasts (two- to five-year horizons) is limited because they are based on assumptions about future policy and economic conditions, which can be wrong.
- Exclusion of future policy:
Forecasts are based only on policies that are officially in place when the forecast is made, meaning they can't account for future government policies or significant external events.
Key takeaways
- Not a perfect science:
Economic forecasting is inherently uncertain and influenced by many variables, so forecasts are not guaranteed to be correct.
- Best for short-term guidance:
OBR forecasts are most accurate in the short term and for guiding immediate policy decisions, but their accuracy decreases significantly for longer-term projections.
- Use with caution:
They should be viewed as a tool for understanding the potential economic impact of current policies, rather than as a precise prediction of the future.