Agnostic Risk Parity: Taming Known and Unknown-Unknowns
12 Pages Posted: 29 Oct 2016
Date Written: October 27, 2016
Markowitz' celebrated optimal portfolio theory generally fails to deliver out-of-sample diversification. In this note, we propose a new portfolio construction strategy based on symmetry arguments only, leading "Eigenrisk Parity" portfolios that achieve equal realized risk on all the principal components of the covariance matrix. This holds true for any other definition of uncorrelated factors. We then specialize our general formula to the most agnostic case where the indicators of future returns are assumed to be uncorrelated and of equal variance. This "Agnostic Risk Parity" (AGP) portfolio minimizes unknown-unknown risks generated by over-optimistic hedging of the different bets. AGP is shown to fare quite well when applied to standard technical strategies such as trend following.
Keywords: Quantitative Portfolio Management, Portfolio Construction, Asset Allocation, Risk Parity, Risk Budgeting, Diversification, Markowitz, Alternative Beta
JEL Classification: G11, D81, C1
Suggested Citation: Suggested Citation