Furthermore, Hendry and Hubrich (2010) demonstrate in their Monte Carlo simulations that the use of disaggregate information improves aggregate forecasts if the disaggregates follow different stochastic structures and the components are interdependent. Like aggregate economic series, aggregate financial series consist of a range of individual series each with its own unique information set. Therefore, the use of individual component data can potentially enhance the accuracy of aggregate stock index return forecasts.
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