Abstract
Private-equity asset owners seeking to reduce downside risk and increase upside probability would logically benefit from indexing prospective asset managers by their skill. However, theoretical deficiencies and a lack of rigorous market calibration prevent the metrics and techniques commonly used in private equity from isolating manager skill. In this article, the authors introduce a new conceptual framework for a repeatable decomposition of private equity returns that disambiguates the quantification of manager skill. Modern proxy benchmarks are a key component of the framework for their definition of systemic returns specific to the target asset. They satisfy the fundamental properties of an index (systematic, transparent, and investable) suggested by Andrew Lo and the CFA Institute’s SAMURAI criteria for a valid benchmark. However, the authors propose that the integrity of the decomposition requires that the benchmark’s similarity (to target) and its stability be systematically derived, measured quantities. The authors discuss these two new properties in conjunction with the technology that enables the construction of modern proxy benchmarks and their active management over time. With systemic returns thus defined, excess returns against the modern proxy benchmark are attributed to dynamic elements under the control of the manager, which the authors define as manager alpha. Systemic returns in excess of a broad/policy benchmark are deemed static elements. Static elements measure the portion of returns attributable to size and sector selection, in which a manager tends to specialize and which are known to the limited partner investor prior to investment. Although both static and dynamic elements contribute active returns to the investment, it is the dynamic elements-alpha-that should merit attention (and high fees) from limited partners.
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