Joint research unit 7235

Is the Market Portfolio Efficient? A New Test to Revisit the Roll (1977) versus Levy and Roll (2010) Controversy

Marie Brière, Kim Oosterlinck, Ariane Szafarz, Valérie Mignon, Bastien Drut

Levy and Roll (Review of Financial Studies, 2010) have recently revived the debate related to the market portfolio’s efficiency suggesting that it may be mean-variance efficient after all. This paper develops an alternative test of portfolio mean-variance efficiency based on the realistic assumption that all assets are risky. The test is based on the vertical distance of a portfolio from the efficient frontier. Monte Carlo simulations show that our test outperforms the previous mean-variance efficiency tests for large samples since it produces smaller size distortions for comparable power. Our empirical application to the US equity market highlights that the market portfolio is not mean-variance efficient, and so invalidates the zerobeta CAPM.

AGENDA

Tuesday 31 January 2023

Recherche et Economie et Socioéconomie Politique, des Institutions et des Régulations (RESPIR)

Nathalie Heinich (EHESS)

ANNULÉ ET REPORTÉ À UNE DATE ULTÉRIEURE

Valeur et mesure: aux limites de l’approche économique

Tuesday 31 January 2023

Valeur et mesure: aux limites de l’approche économique

Nathalie Heinich (EHESS)

ANNULÉ ET REPORTÉ À UNE DATE ULTÉRIEURE

Valeur et mesure: aux limites de l’approche économique

Tuesday 31 January 2023

Series of Webinars on Economics of Environment, Energy and Transport (SWEEET)

Aurelien Saussay(OFCE, Sciences Po, Paris), Misato Sato, (London School of Economics and Political Science) Francesco Vona (University of Milan) Layla O’Kane(Lightcast)

En visio

Who’s fit for the low-carbon transition? Emerging skills and wage gaps in job ad data

Tuesday 31 January 2023

Who’s fit for the low-carbon transition? Emerging skills and wage gaps in job ad data

Aurelien Saussay(OFCE, Sciences Po, Paris), Misato Sato, (London School of Economics and Political Science) Francesco Vona (University of Milan) Layla O’Kane(Lightcast)

En visio

Who’s fit for the low-carbon transition? Emerging skills and wage gaps in job ad data

Thursday 2 February 2023

Nouveaux doctorants

Nabil Daher, Michaël Guilloussou, Daniela Lima Rente, Maryam Soltani

Nouveaux doctorants

Thursday 2 February 2023

Lunch

Nabil Daher, Michaël Guilloussou, Daniela Lima Rente, Maryam Soltani

Nouveaux doctorants

Thursday 2 February 2023

Groupe de travail Economie Comportementale

Carole Treibich (Laboratoire d'Economie Appliquée de Grenoble GAEL)

Salle 101

Disentangling peer effects in transportation mode choice: the example of active commuting

Thursday 2 February 2023

Disentangling peer effects in transportation mode choice: the example of active commuting

Carole Treibich (Laboratoire d'Economie Appliquée de Grenoble GAEL)

Salle 101

Disentangling peer effects in transportation mode choice: the example of active commuting

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