Asset Classes Explained

Equities (stocks) represent ownership in businesses and derive their return from earnings growth, dividend income, and multiple expansion. They are long-duration assets -- most of their value reflects earnings many years into the future -- which makes them sensitive to discount rate changes (interest rates) and to long-horizon growth expectations. Equities have historically provided the highest real returns of any major asset class over long periods, compensated by their higher volatility and episodic severe drawdowns.

Fixed income (bonds) are debt instruments that provide contractually specified cash flows -- coupon payments and principal repayment. Investment-grade bonds prioritize capital preservation and income. High-yield bonds offer higher coupons but carry meaningful default risk and behave more like equities in stressed markets. Duration -- the sensitivity of bond prices to interest rate changes -- is the primary risk factor: long-duration bonds fall sharply when rates rise. Commodities (oil, metals, agricultural products) are real assets that tend to outperform in inflationary environments precisely when bonds and growth equities struggle. Real estate offers inflation protection through rent escalation and provides a blend of income and capital appreciation.

Alternative assets -- hedge funds, private equity, private credit, infrastructure -- have grown dramatically as institutional allocations shifted toward illiquid premium capture. The pitch is lower correlation to public markets and access to illiquidity premium. The reality is that private equity returns, when properly compared to public small-cap value with similar leverage, are less distinctive than they appear. Illiquid alternatives do reduce mark-to-market volatility (the portfolio looks less volatile because prices are not continuously updated), but the underlying economic exposure is often more correlated to equities than the smoothed returns suggest.

The foundational assumption of asset allocation -- that diversification across asset classes improves risk-adjusted returns -- rests on correlation. When asset A falls, asset B rises (or at least doesn't fall as much), reducing portfolio volatility below what any single asset would produce. The canonical diversifier is long-duration US Treasuries, which historically rallied during equity bear markets as investors fled to safety and the Fed cut rates. The 60/40 portfolio (60% equities, 40% bonds) was built on this negative correlation.

2022 shattered that assumption for many investors who had not experienced an inflationary bear market. When inflation surges, the Fed raises rates aggressively, which simultaneously crushes bond prices (because they are long-duration instruments) and equity multiples (because higher discount rates reduce present values of future earnings). The result in 2022 was one of the worst years on record for 60/40 portfolios -- both equities and bonds fell sharply together. This was not unprecedented: the 1970s produced the same dynamic. Correlations are regime-dependent, not structural constants.

Real assets -- commodities, energy stocks, infrastructure, TIPS -- perform well precisely in the inflationary regimes where traditional 60/40 suffers. Gold and commodity exposure, widely dismissed as portfolio drag during the 2010s disinflationary expansion, provided meaningful protection in 2022. The practical lesson: asset class correlations reflect the current macro regime, and a portfolio designed for one regime may perform very differently in another. Scenario analysis across regimes -- growth/inflation, growth/deflation, recession/deflation, recession/inflation -- is more robust than optimization based on historical average correlations.