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Quantification of the High Level of Endogeneity and of Structural Regime Shifts in Commodity Markets

  • Vladimir Filimonov
  • David Bicchetti
  • Nicolas Maystre

We propose a “reflexivity” index that quantifies the relative importance of short-term endogeneity/reflexivity for several commodity futures markets (corn, oil, soybeans, sugar, and wheat) and a benchmark equity futures market (E-mini S&P 500). Our reflexivity index is defined as the average ratio of the number of price moves that are due to endogenous interactions to the total number of all price changes, which also include exogenous events. Estimated reflexivity levels are obtained by calibrating the Hawkes self-excited conditional Poisson model on time series of price changes. The Hawkes model accounts simultaneously for the co-existence and interplay between the exogenous impact of news and the endogenous mechanism by which past price changes may influence future price changes. Our robustness tests show that our index provides a ‘pure’ measure of endogeneity that is independent of the rate of activity, order size, volume or volatility. We find an overall increase of the reflexivity index since the middle of the first decade of the 21st century to October 2012, which implies that, on a monthly basis, at least 60–70 per cent of commodity price changes are now due to self-generated activities rather than novel information, compared to 20–30 per cent earlier. While our reflexivity index is defined on short-time windows (10 minutes) and thus does not capture long-term memory, we discover striking coincidence between its dynamics and that of the price hikes and abrupt falls that developed since 2006 and culminated in early 2009.

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Paper provided by United Nations Conference on Trade and Development in its series UNCTAD Discussion Papers with number 212.

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Date of creation: 2013
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Handle: RePEc:unc:dispap:212
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