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Global Market Report - The Mid-Cap Effect - December 2012

In this paper, we show how Barra models capture the risk and return characteristics of mid-cap stocks using the Non-Linear Size factor. This factor describes the return difference between mid-cap stocks and the overall market, net other factors. We show that since the global financial crisis of 2008, the impressive performance of global mid-caps was attributed, in large part, to their exposure to Non-Linear Size. Monitoring the exposure to this factor provides investors with a view of the strength of the Mid-Cap Effect in their portfolios.