What is the UK Buffett Indicator?
The UK Buffett Indicator measures the total capitalisation of the British stock market, proxied by the FTSE All-Share, against UK GDP. The British market has distinctive characteristics that shape its valuation: it is heavily weighted toward energy majors, miners, banks and consumer-staples multinationals, many of which earn the bulk of their revenue overseas. This international revenue base means the ratio can look elevated relative to purely domestic economic output, since a large share of the market's earnings has little to do with the UK economy itself. Historically the UK has traded at a valuation discount to the US, and following the Brexit referendum that discount widened as international investors reduced exposure. The indicator is therefore useful both as a long-term valuation gauge and as a barometer of international sentiment toward UK assets, with a persistently low reading often cited as evidence that British equities offer value relative to global peers.
Formula & Methodology
Created by Applied from Warren Buffett's market-cap-to-GDP concept.
Historical Performance & Limitations
FTSE multinationals earn most revenue abroad, so market cap poorly matches domestic GDP. Large dividend payers and the market's old-economy tilt make it behave differently from growth-led indices.
Status Classification
| Level | Meaning |
|---|---|
| Strong Undervaluation | Market trading significantly below historical average |
| Fair Value | Market aligned with historical valuation metrics |
| Moderate Overvaluation | Market elevated above historical norms |
| Severely Overvalued | Extreme historical deviation; high downside risk |