In finance, the Black–Litterman model is a mathematical model for portfolio allocation 1, No. 2: pp. · Black F. and Litterman R.: Global Portfolio Optimization, Financial Analysts Journal, September , pp. 28–43 JSTOR The Black-Litterman asset allocation model is an extension of pricing model ( CAPM) and Harry Markowitz’s mean-variance optimization theory. in a global benchmark such as MSCI World as a neutral starting point, asset. The Black-Litterman model was made as an improvement of the . Robert Litterman stated in their article Global Portfolio Optimization that ” asset allocation.

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In general, when there are portfolio constraints – for example, when short sales are not allowed – the easiest way to find the optimal portfolio is to use the Black—Litterman model to generate the expected returns for the assets, and then use a mean-variance optimizer to solve the constrained optimization problem. Black—Litterman overcame this problem by not requiring the user to input estimates of expected return; instead it assumes that the initial expected returns are whatever is required so that the equilibrium asset allocation is equal to what we observe in the markets.


Asset allocation is the decision faced by an investor who must choose how to allocate their portfolio across a few say six to twenty asset classes.

Retrieved from ” https: By blaack this site, you agree to the Terms of Use and Privacy Policy. For example, a globally invested pension fund must choose how much to allocate to each major country or region.

It seeks to overcome problems that institutional investors have encountered in applying modern portfolio theory in practice. From Wikipedia, the free encyclopedia.

In principle Modern Portfolio Theory the mean-variance approach of Markowitz offers a solution to this problem once the expected returns and covariances portfoliio the assets are known. Views Read Edit View history. From this, the Black—Litterman method computes the desired mean-variance efficient asset allocation.

This page was last edited on 16 Februaryat In financethe Black—Litterman model is a mathematical model for portfolio allocation developed in at Goldman Sachs by Fischer Black and Robert Littermanand published in While Modern Portfolio Theory is an important theoretical advance, its application has universally encountered a problem: The user is only required to state how his assumptions about expected returns differ from the markets and to state his degree of confidence in the alternative assumptions.

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The model starts with the equilibrium assumption that the asset allocation of a representative agent should be proportional to the market values of the available assets, and then modifies that to take into account the ‘views’ i.