A portfolio manager runs 60% equities, 40% bonds in 2021. Equities carry 15% annualised volatility; bonds carry 4%. The equity sleeve contributes roughly 92% of total portfolio risk. The "balanced" portfolio is structurally an equity portfolio wearing a disguise. When equities dropped 18% in early 2022, the bonds were supposed to cushion the fall — they dropped 13% simultaneously instead.
Risk parity reframes the question entirely. Rather than allocating capital by dollar weight, it allocates by risk contribution. Each asset class — equities, bonds, commodities, inflation-linked assets — receives a position sized so its volatility contribution equals every other sleeve's. A typical implementation levers the bond allocation to match equity-level risk, producing a portfolio where each sleeve contributes roughly 25% of total risk.
The mechanics work like this. If equities run at 15% vol and bonds at 5% vol, bonds receive 3× the capital of equities to equalise contributions. A $1,000,000 portfolio might hold $200,000 in equities and $600,000 in leveraged bonds, with the remainder in commodities and real assets. Target total portfolio volatility is typically set at 10–12% annualised, managed dynamically as correlations shift.
The strategy's structural vulnerability surfaces in rate shock cycles. Leveraged bonds behave like a single correlated block when central banks tighten aggressively. In 2022, the equity-bond correlation flipped sharply positive — both asset classes sold off together. A standard risk parity portfolio lost 15–20% that year, worse than a plain 60/40 fund, because leverage magnified the bond drawdown rather than dampening it. The diversification model assumed a correlation regime that no longer existed. Traders studying this dynamic often reference the risk parity framework on Investopedia, while the theoretical underpinning draws from the broader risk parity literature on Wikipedia; the regime-dependency problem is examined in depth through correlation coefficient analysis when constructing multi-asset models.
Risk parity is an elegant solution to a real problem — equity-dominated risk — but it is not regime-agnostic.
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