Correlation dynamics of global industry portfolios
This paper investigates the time series of realized correlations between global industries and the world market over the 1979-2008 period. The behavior of industry correlations is characterized by long-term swings, with a period of historically low correlations in the late 1990s. The Telecommunications and the Financials industries show a positive secular trend. Global industry correlations move countercyclically. Furthermore, there is evidence that industry correlations are higher for market downside moves than for upside moves.
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