Active and Passive Investing: Understanding Samuelson’s Dictum

Nicolae Gârleanu *, Lasse Heje Pedersen

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelpeer review

40 Downloads (Pure)


We model how investors allocate between asset managers, managers choose portfolios of multiple securities, fees are set, and security prices are determined. Investors are indifferent between higher-cost informed managers and lower-cost uninformed managers, interpreted as passive managers as their portfolio is linked to the " expected market portfolio." We make precise Samuelson's dictum by showing that active investors reduce micro-inefficiencies more than they do macro-inefficiencies. In fact, all inefficiency arises from systematic factors when the number of assets is large. Further, we show how the costs of active and passive investing affect macro- and micro-efficiency, fees, and assets managed by active and passive managers. Our findings help explain the rise of delegated asset management and the resultant changes in financial markets.
TidsskriftThe Review of Asset Pricing Studies
Antal sider62
StatusUdgivet - 13 aug. 2021

Bibliografisk note

Epub ahead of print. Published online: 13 August 2021.