The Illiquidity Mirage: Are Private Market Investors Paying for Smooth Returns?
The conventional wisdom of investment finance has long held that investors demand—and receive—a premium for bearing the risks of illiquidity in private markets. Yet emerging research challenges this foundational assumption, suggesting that what investors perceive as compensation for illiquidity may instead be a premium paid for artificially smoothed returns and reduced volatility visibility. This fundamental reassessment has profound implications for how institutional investors, pension funds, and wealth managers should evaluate their private market allocations and the true risk-adjusted returns they're actually generating.
The traditional illiquidity premium thesis rests on a straightforward economic principle: investors should demand higher returns for accepting reduced access to their capital. In private equity, private credit, and other illiquid assets, this premium has long justified allocations that tie up capital for extended periods, often a decade or more. However, recent analysis suggests that what appears to be an illiquidity premium may actually represent something quite different—a valuation smoothing effect that artificially reduces reported volatility without changing underlying economic risk.
The Mechanics of Return Smoothing in Private Markets
The critical distinction lies in how private market assets are valued compared to their public counterparts. Unlike publicly traded securities, which are continuously repriced in real-time markets, private market investments rely heavily on appraisal-based valuations conducted periodically by investment managers, advisors, or third-party firms. This fundamental difference in valuation methodology creates a crucial distortion in how returns appear to investors.
When a private equity fund or private credit vehicle marks its portfolio companies to market, valuations don't fluctuate daily or even quarterly in the dramatic fashion characteristic of stock prices. Instead, these valuations typically incorporate:
- Smoothed valuation adjustments based on management discretion and valuation models
- Infrequent revaluations that lag behind actual market conditions
- Limited transparency into the underlying methodology and assumptions
- Appraisal-driven inputs rather than transaction-based or market-based pricing
This creates what researchers increasingly recognize as the illiquidity premium paradox: investors aren't necessarily earning higher risk-adjusted returns; rather, they're experiencing lower reported volatility because the true economic volatility is masked by the valuation process itself. The underlying risks haven't disappeared—they've simply been obscured.
Consider the practical implications. When public equity markets decline sharply—as happened in 2022, 2020, and numerous other periods—quoted stock prices plummet immediately and visibly. Private portfolio companies facing identical economic headwinds may not see their valuations adjusted downward with the same speed or magnitude, creating the illusion of portfolio stability during market stress. This appearance of calm doesn't mean the underlying assets were genuinely safer; it means their true economic condition was simply reported less frequently.
Market Context: The Structural Advantages of Opacity
The private markets industry has experienced explosive growth over the past two decades, with assets under management in private equity, private credit, and other alternative strategies growing from hundreds of billions to several trillion dollars globally. This expansion has been fueled substantially by institutional allocations seeking the perceived benefits of illiquidity premiums and smoother returns.
The current market environment has intensified scrutiny of these assumptions. Several factors are driving this reassessment:
Valuation Pressure and Reality Checks: As many private market funds face extended holding periods and delayed exits, the gap between appraisal-based valuations and realistic exit values has widened. Recent forcing events—from rising interest rates affecting leveraged buyouts to credit market dislocations impacting private credit—have revealed instances where marked values diverged significantly from achievable transaction prices.
Behavioral Finance Insights: The smoothing of returns may actually be producing an unintended benefit: by reducing visible volatility, private market reporting encourages more disciplined investor behavior. Investors don't panic during market stress because they don't see their portfolio declining as sharply. This behavioral benefit is real, but it's distinct from—and should be separately valued from—actual economic compensation for illiquidity.
Competitive Landscape Dynamics: As alternative asset managers ($BLK's iShares division, Blackstone, Apollo Global Management, Carlyle Group, and others) have grown larger, the competitive pressure to show consistent, attractive returns has arguably intensified incentives to manage reported volatility. The reputation and fund-raising benefits of demonstrating low volatility create institutional pressures toward smoother reporting.
Regulatory Evolution: Growing scrutiny from regulators and pension fund oversight bodies has increased pressure for transparent valuation methodologies and more frequent mark-to-market assessments, potentially reducing the opacity that enables return smoothing.
Investor Implications: Revaluing Private Market Allocations
If the illiquidity premium is actually a return-smoothing effect rather than genuine risk compensation, the implications for portfolio construction are substantial. Investors may need to fundamentally reconsider their private market allocation decisions:
Risk Assessment: The apparent reduction in volatility doesn't reflect lower risk; it reflects less frequent measurement of risk. When economic stress forces valuations to reality-check, investors may discover they've been holding more risk than reported. This risk was always present—the appraisal methodology simply masked it from view.
Return Expectations: If smoothing effects rather than illiquidity premiums explain private market returns, investors should adjust their return expectations downward. The historical performance of private markets may overstate true risk-adjusted returns when adjusted for the valuations smoothing effect and the cost of illiquidity itself.
Diversification Benefits: The low correlation between private market returns and public equity returns, which has been a primary justification for allocation, may be partly illusory. During genuine stress periods when correlation matters most—like 2008 or 2020—the true correlation between private and public markets may be much higher than appraisal-based return reporting suggests.
Fee Justification: If private market managers are charging performance and management fees based on smoothed returns that don't represent true economic gains, fee structures may not be justified by actual value creation. This is particularly relevant given that private equity and private credit fees typically run 1-2% annually plus performance fees of 15-20%.
Liquidity Costs: The true cost of illiquidity extends beyond the premium earned. Capital locked up in illiquid investments cannot be deployed opportunistically during market dislocations when entry prices are most favorable. This represents a genuine economic cost that may exceed any premium earned.
For pension funds and endowments that have substantially increased private market allocations over the past decade—often targeting 20-40% of total assets—this reassessment suggests the need for more rigorous due diligence on underlying valuations, more frequent valuation transparency, and potentially more cautious allocation levels than current practices suggest.
Forward-Looking Considerations
The implications extend to how investors should evaluate manager selection in private markets. If all managers benefit from the same appraisal-based smoothing effects, performance comparisons become less reliable. Differentiation based on apparent volatility reduction may reflect valuation practices rather than true skill. Investors should instead focus on the consistency of valuations relative to ultimate transaction outcomes and the transparency with which managers conduct and communicate valuation decisions.
As market conditions continue to evolve—with elevated interest rates, compressed valuations, and extended holding periods creating pressure on private market returns—the gap between appraisal-based valuations and economic reality is likely to widen rather than narrow. This creates both a challenge and an opportunity: the challenge is that portfolios may underperform expectations as smoothed valuations are ultimately reconciled with reality; the opportunity is that realistic reassessment of private market benefits may lead to more rational allocation decisions based on genuine economic returns rather than reporting artifacts.
The evolution of this debate will likely shape private markets allocation strategy for years to come, as sophisticated institutional investors increasingly recognize that smoother returns and genuine risk compensation are not synonymous, and that understanding which premium they're actually receiving is essential to sound investment decision-making.