Monevator's The Accumulator Proposes Splitting Passive Portfolio Defenses Across Four Asset Classes

In his Q3 2026 update, Monevator blogger The Accumulator proposes that a passive portfolio built from scratch should split defensive assets evenly between gold, commodities, short index-linked bonds and nominal bonds, rather than relying on a single nominal-bond sleeve.

The context: Vanguard's UK Government Bond Index Fund, with roughly 13-year duration, has posted an annualised loss of 5.7% since its March 2020 peak. That drawdown dragged the Slow & Steady model portfolio to a 7.6% annualised return since launch, despite equity blocs returning 13.7% annualised over the same span.

Backtesting the alternative allocation from end-2010 yields 8.2% annualised — 0.6 percentage points higher. The mechanism is diversification of defensive sources: gold hedges currency debasement, commodities hedge supply shocks, short-duration linkers hedge real-rate rises, and nominal bonds retain liquidity buffering.

The limitation: the 0.6pp gap rests on a single backtest window dominated by one long-duration bond drawdown; a different rate or inflation regime could reverse the ranking. Four asset classes also add rebalancing complexity and tax friction. The author notes the current portfolio has only four years left to run, so the adjustment is partly driven by time horizon rather than pure return optimisation.