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Examining the dynamic relationship between spot and future prices of agricultural commodities

Author

Listed:
  • Hernandez, Manuel
  • Torero, Maximo
Abstract
This study examines the dynamic relationship between spot and futures prices of agricultural commodities. We first briefly discuss what the non-arbitrage and asset pricing theory has to say about the relationship between spot and futures markets. Next, using recent price data for corn, wheat, and soybeans, we perform Granger causality tests to empirically uncover the direction of information flows between spot and futures prices. Linear as well as nonlinear (nonparametric) causality tests are conducted on both spot and futures returns and their volatility. The results indicate that spot prices are generally discovered in futures markets. In particular, we find that changes in futures prices lead changes in spot prices more often than the reverse. These findings also contribute to the debate on alternative instruments to address excessive volatility in grain markets. Our results support, for example, the viability of implementing a global virtual reserve, recently proposed by von Braun and Torero (2008, 2009), to prevent disproportionate spikes in grain spot prices through signals and, if necessary, market assessment in the exchange of futures.

Suggested Citation

  • Hernandez, Manuel & Torero, Maximo, 2010. "Examining the dynamic relationship between spot and future prices of agricultural commodities," IFPRI discussion papers 988, International Food Policy Research Institute (IFPRI).
  • Handle: RePEc:fpr:ifprid:988
    as

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    References listed on IDEAS

    as
    1. Robles, Miguel & Torero, Maximo & von Braun, Joachim, 2009. "When speculation matters:," Issue briefs 57, International Food Policy Research Institute (IFPRI).
    2. Garbade, Kenneth D & Silber, William L, 1983. "Price Movements and Price Discovery in Futures and Cash Markets," The Review of Economics and Statistics, MIT Press, vol. 65(2), pages 289-297, May.
    3. Crain, Susan J & Lee, Jae Ha, 1996. "Volatility in Wheat Spot and Futures Markets, 1950-1993: Government Farm Programs, Seasonality, and Causality," Journal of Finance, American Finance Association, vol. 51(1), pages 325-343, March.
    4. von Braun, Joachim & Torero, Maximo, 2008. "Physical and virtual global food reserves to protect the poor and prevent market failure:," Policy briefs 4, International Food Policy Research Institute (IFPRI).
    5. Ronald I. McKinnon, 1967. "Futures Markets, Buffer Stocks, and Income Stability for Primary Producers," Journal of Political Economy, University of Chicago Press, vol. 75(6), pages 844-844.
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    7. Turnovsky, Stephen J, 1983. "The Determination of Spot and Futures Prices with Storable Commodities," Econometrica, Econometric Society, vol. 51(5), pages 1363-1387, September.
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    13. William G. Tomek & Roger W. Gray, 1970. "Temporal Relationships Among Prices on Commodity Futures Markets: Their Allocative and Stabilizing Roles," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 52(3), pages 372-380.
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    Keywords

    agricultural commodity markets; futures prices; granger causality; spot prices;
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