Risk Parity and What Actually Broke in 2022

Risk parity allocates by risk contribution rather than by capital. Because bonds are less volatile than equities, equalising their risk contribution requires holding far more bonds by capital weight, and typically requires leverage to lift the total portfolio return to a useful level. The approach produced excellent results for roughly three decades.

Those three decades shared a feature that the framework depends on: equities and bonds were negatively correlated. When growth disappointed, equities fell and bonds rallied as rates declined, so the bond leg cushioned the equity leg. The entire structure of the approach rests on that relationship holding.

The correlation was conditional all along

Stock-bond correlation is not a constant of nature. It depends on whether the dominant macro shock is a growth shock or an inflation shock. Growth shocks push equities and yields in the same direction, which makes bond prices move opposite to equities. Inflation shocks push yields up while compressing equity multiples, which makes bond prices and equities fall together.

The post-1990 period was dominated by growth shocks in a disinflationary environment, which produced the negative correlation the strategy relies on. 2022 was an inflation shock, the correlation flipped positive, and both legs fell simultaneously. The leverage that had improved returns for thirty years then amplified a loss on the leg that was supposed to be the defensive one.

What the episode does and does not prove

It does not prove that risk-based allocation is unsound. Sizing by risk contribution rather than capital remains a more coherent starting point than arbitrary weights. What the episode proves is narrower and more useful: a framework calibrated on a period during which a critical input was stable will fail when that input changes, and leverage converts the failure from disappointing to severe.

The defensible version of the approach treats correlation as a regime-dependent variable to be monitored rather than a parameter to be estimated once from history. That change does not make the strategy immune to an inflation shock. It does mean the shock arrives as a recognised risk that has been sized for, rather than as a surprise embedded in the machinery.

The Same Assumption Sits Inside the Standard Balanced Fund

The conventional sixty-forty portfolio makes exactly the same bet on negative stock-bond correlation, without leverage and without labelling it as a bet. Its defensive allocation works on the assumption that the bond leg rallies when the equity leg falls, which is the identical conditional relationship. The 2022 experience was less severe for a balanced fund only because there was no leverage multiplying the bond loss.

This matters for the many Australian investors whose superannuation sits in a balanced or growth option, since the same regime dependency is present in the default allocation. Recognising it does not require abandoning the structure. It requires understanding that the defensive sleeve is conditionally defensive, and that the condition is the absence of an inflation shock.

The regime-dependent maths in numbers

Consider a portfolio holding equities and bonds at equal risk contribution, unlevered. In the negative-correlation regime, a 15 percent equity drawdown accompanied by a 5 percent bond rally produces a portfolio loss of roughly five percent, comfortably absorbable. In the positive-correlation regime, the same equity drawdown accompanied by a 5 percent bond decline produces a loss of ten percent, twice as damaging with the same nominal exposures.

Adding leverage magnifies both outcomes proportionally, but the ratio between them is unchanged. This is the honest way to describe what regime shift does to the strategy: not that risk parity fails, but that the size of the loss doubles for the same underlying moves. Portfolios calibrated on the assumption that they will never be tested by the doubled version are effectively short volatility, and the trade will occasionally cost what a short volatility trade costs.

The Australian balanced-fund exposure

Default super options in Australia typically sit in a growth or balanced allocation with roughly 70 percent growth assets and 30 percent defensive, and the defensive sleeve depends on the same stock-bond correlation assumption. Australian members of default funds therefore hold the same regime-dependent bet risk parity holds, without leverage, and generally without any awareness that the defensive allocation is conditionally defensive.

The 2022 experience for Australian balanced funds delivered simultaneous losses in both sleeves and produced calendar-year losses that surprised most members. Nothing in the strategy was flawed. The regime was the one the strategy is exposed to.