The 2000s were characterized by widespread enthusiasm in the world of institutional investments for the so-called “Yale model”. Developed by David Swensen, historic Chief Investment Officer of the Yale Endowment, this approach favored an allocation strongly oriented towards alternative instruments – such as private equity, hedge funds and real assets – rather than the traditional 60/40 portfolio made up of listed shares and bonds. The underlying assumption was that private markets, less liquid and more inefficient, could offer higher risk premiums for patient investors. This narrative has exerted a strong pull on pension funds and foundations of all sizes, pushing them to chase the returns associated with private equity and hedge funds, often without adequately considering operational constraints, liquidity needs and internal resources. Jeffrey Cleveland, Chief Economist at Payden & Rygel, explains it
The great reallocation towards alternatives
Since the publication of Pioneering Portfolio Management in 2000, US public pension funds – explains the expert – have progressively changed the composition of their portfolios. In 2001, alternative investments represented approximately 14% of risky assets; in 2021, that share was closer to 40%. Similarly, large endowment funds have exceeded 50% allocation to alternatives, while smaller ones have also reached shares close to 20%. This transformation was mainly financed by reducing exposure to listed shares (from 59% to 47%) and tripling exposure to alternative instruments (from 11% to 30% in two decades). This evolution was not driven by financing constraints or an increase in risk appetite, but by the application of theoretical allocation models – in particular those based on mean-variance analysis – which attributed higher expected returns and lower correlation with public markets to the alternatives. The critical point lies precisely in the hypotheses: relatively simple assumptions on returns and correlations are enough to make the alternatives apparently more attractive. Over the past two decades, the “perceived alpha” of these asset classes has increased by approximately 58 basis points, pushing allocations further.
Limits in practice
However, the theoretical benefits of alternative investments manifest themselves mainly for large institutions with resources, expertise and privileged access. First, access to the best funds is uneven: larger investors get the most attractive opportunities, while smaller ones often target underperforming segments of the market. The data shows that, in almost every one of the last 24 years, at least one pension fund has underperformed the stock market through private equity. Secondly, the costs are significantly higher. Management fees of up to 2%, performance fees of 20% and additional operating expenses can bring the overall cost for small investors to 3-4% per year. Finally, private asset investments require complex organizational structures: in-depth due diligence, ongoing monitoring, cash flow management and valuation oversight. In the absence of these capabilities, the investor exposes himself to the risk of holding opaque and difficult to value instruments.
A further critical element concerns diversification: while it is possible for large institutions to build large and well-articulated portfolios, smaller entities often do not have the necessary scale. Furthermore, over time, the diversification benefits of alternatives have reduced: private equity and real estate returns tend to closely track those of stock markets, while government bonds have maintained a more stable negative correlation.
It is therefore fair to ask whether investors have replaced proven diversification tools with more expensive and less transparent alternatives. An interesting exception is gold, which offers liquidity, low costs and a long-term correlation close to zero with stocks, contributing to portfolio resilience.
The false stability of alternatives
Imagining an alternative scenario in which the institutions had remained anchored to the public markets, with a portfolio of 60% stocks and 40% US bonds, this strategy, despite greater volatility in the short term, in the long term would have generated an outperformance compared to the median return of pension funds of around 50%, even in the absence of rebalancing. The benefits would have been clear: lower costs, greater transparency, constant liquidity and simpler governance. Limited active strategies, such as increasing bond exposure during downturns, would have further improved results.
The perception of stability associated with private markets is partly illusory. The absence of daily valuations reduces apparent volatility, while real prices may adjust with a delay (see Figure below). However, this stability comes at a cost: in stressful situations, liquidity can disappear, making it difficult to disinvest. On the contrary, public markets offer immediate transparency: prices adapt quickly, but guarantee the presence of counterparties even in phases of greatest tension. For smaller institutions, this translates into simpler and more controllable management, without capital demands or complex operational constraints.
The real advantage of the Yale model – concludes the expert – did not lie so much in the alternative tools, but in factors that were difficult to replicate: size, governance and privileged access. Only a few institutions have the resources needed to fully exploit these opportunities. For many, a simpler strategy – based on public stocks, quality bonds and possibly a low-cost diversifier such as gold – would have been a more efficient choice in terms of risk-adjusted returns, costs and management complexity.
Looking to the future, 2026 could mark a return to this approach: a transparent, liquid and low-cost wallet. Ultimately, the real alternative lies not in complex tools, but in simplicity.
