The rapid growth of open-end funds investing in illiquid assets—like real estate, private equity, and credit—has introduced both opportunity and fragility, particularly due to stale pricing risks that can lead to wealth transfers between investors. 

Research shows that these funds often experience artificially smooth and lagged returns, which can mislead investors about actual performance and risk, enabling NAV-timing strategies that exploit predictable price movements. Spencer Couts and colleagues developed a more advanced return unsmoothing method to correct for spurious autocorrelation and better measure fund risk and performance, especially in highly illiquid private credit funds. 

However, interval and tender-offer funds help manage these risks by limiting capital flows and allowing managers to avoid forced sales or purchases of illiquid assets.

Finsum: Pooling capital through regulated open-end structures with controlled liquidity offers a more stable way to invest in illiquid markets.