What is risk parity and how does it differ from traditional asset allocation?

Risk parity is a portfolio construction approach where each asset class contributes equally to total portfolio risk, rather than receiving equal capital allocations.

The problem with traditional allocation:

Consider a classic 60% equity / 40% bond portfolio:

• Equities typically have ~16% volatility
• Bonds typically have ~5% volatility
• Despite the 60/40 capital split, equities contribute ~90% of portfolio risk

The portfolio is essentially a concentrated equity bet disguised as diversification.

Risk parity solution:

Equalize the risk contribution of each asset class. If bonds are less volatile, give them a much larger weight so their risk contribution matches equities.

Simplified example:

The leverage question:

With 76% in bonds and only 24% in equities, the expected return is low. Risk parity advocates argue you should lever up the portfolio to achieve your desired return/risk level. This works because the leveraged risk-parity portfolio has a higher Sharpe ratio than the unlevered traditional portfolio — you're getting more return per unit of risk.

Key assumptions:

• All asset classes have similar Sharpe ratios in the long run
• Correlations are stable enough for the risk decomposition to hold
• Leverage is available at a reasonable cost

Pros:

• Truly diversified across risk sources
• Reduces vulnerability to equity market drawdowns
• Historically produced competitive risk-adjusted returns

Cons:

• Requires leverage, which adds costs and risks
• Relies on bond returns being positive (challenged in rising rate environments)
• Correlation instability during crises can undermine the approach
• Higher turnover from rebalancing to maintain equal risk contributions

Example: Bridgewater's All Weather fund popularized risk parity. During the 2008 crisis, traditional 60/40 portfolios lost ~30%, while risk parity strategies lost ~10-15% — the bond allocation provided meaningful cushioning.

Exam tip: CFA Level II tests the concept of risk budgeting and the motivation for risk parity. Understand why a 60/40 portfolio is actually a 90/10 risk portfolio, and how equalization works.

Explore portfolio construction on AcadiFi's CFA Level II materials.