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Soybean Inventory and Forward Curve Dynamics

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Author Info

  • Hélyette Geman

    ()
    (Finance Department, University Paris Dauphine, and ESSEC Business School, 95021 Cergy-Pontoise, France)

  • Vu-Nhat Nguyen

    ()
    (Finance Department, University Paris Dauphine, and ESSEC Business School, 95021 Cergy-Pontoise, France)

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    Abstract

    We present two results concerning soybean prices. First, we exhibit a simple relationship between stocks and price volatility. The observation of an increasing price volatility with decreasing inventory is often mentioned in the literature, but has so far been documented using a proxy for inventory (see Fama and French 1987, 1988; Litzenberger and Rabinowitz 1995). Instead, we reconstruct a yearly, quarterly, and monthly database of worldwide soybean inventories using aggregate data from the United States, Brazil, and Argentina. We show that under all time scales, price volatility is an increasing linear function of inverse inventory, which we term "scarcity." Second, we show how the addition of the factor scarcity in a state-variable approach to the dynamics of the term structure of soybean forward prices improves the quality of the fit. We document this property on a 25-year database of CBOT futures contracts and show that the superior accuracy also affects long-maturity futures contracts, an important property for the valuation of long-term origination contracts between producing countries and the agrifood industry.

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    File URL: http://dx.doi.org/10.1287/mnsc.1050.0361
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    Bibliographic Info

    Article provided by INFORMS in its journal Management Science.

    Volume (Year): 51 (2005)
    Issue (Month): 7 (July)
    Pages: 1076-1091

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    Handle: RePEc:inm:ormnsc:v:51:y:2005:i:7:p:1076-1091

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    Related research

    Keywords: term structure of soybean forward prices; state variables; scarcity-related volatility;

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    Cited by:
    1. Geman, Hélyette & Smith, William O., 2013. "Theory of storage, inventory and volatility in the LME base metals," Resources Policy, Elsevier, vol. 38(1), pages 18-28.
    2. Symeonidis, Lazaros & Prokopczuk, Marcel & Brooks, Chris & Lazar, Emese, 2012. "Futures basis, inventory and commodity price volatility: An empirical analysis," Economic Modelling, Elsevier, vol. 29(6), pages 2651-2663.
    3. Geman, Helyette & Vergel Eleuterio, Pedro, 2013. "Investing in fertilizer–mining companies in times of food scarcity," Resources Policy, Elsevier, vol. 38(4), pages 470-480.
    4. Paschke, Raphael & Prokopczuk, Marcel, 2010. "Commodity derivatives valuation with autoregressive and moving average components in the price dynamics," Journal of Banking & Finance, Elsevier, vol. 34(11), pages 2742-2752, November.
    5. Yannick Le Pen & Benoît Sévi, 2013. "Futures Trading and the Excess Comovement of Commodity Prices," AMSE Working Papers 1301, Aix-Marseille School of Economics, Marseille, France, revised Jan 2013.
    6. Dempster, M.A.H. & Tang, Ke, 2011. "Estimating exponential affine models with correlated measurement errors: Applications to fixed income and commodities," Journal of Banking & Finance, Elsevier, vol. 35(3), pages 639-652, March.
    7. Alvaro Cartea & Marcelo G. Figueroa & Helyette Geman, 2008. "Modelling Electricity Prices with Forward Looking Capacity Constraints," Birkbeck Working Papers in Economics and Finance 0802, Birkbeck, Department of Economics, Mathematics & Statistics.
    8. Gonzalo Cortazar & Ivo Kovacevic & Eduardo S. Schwartz, 2013. "Commodity and Asset Pricing Models: An Integration," NBER Working Papers 19167, National Bureau of Economic Research, Inc.
    9. Liu, Peng (Peter) & Tang, Ke, 2010. "No-arbitrage conditions for storable commodities and the modeling of futures term structures," Journal of Banking & Finance, Elsevier, vol. 34(7), pages 1675-1687, July.
    10. Jaime Casassus & Peng Liu & Ke Tang, 2011. "Relative Scarcity of Commodities with a Long-Term Economic Relationship and the Correlation of Futures Returns," Documentos de Trabajo 404, Instituto de Economia. Pontificia Universidad Católica de Chile..
    11. Füss, Roland & Mahringer, Steffen & Prokopczuk, Marcel, 2013. "Electricity Derivatives Pricing with Forward-Looking Information," Working Papers on Finance 1317, University of St. Gallen, School of Finance.
    12. repec:ipg:wpaper:19 is not listed on IDEAS
    13. Nicolas Merener, 2012. "Globally Distributed Production and Asset Pricing:the Rise of Latin America in CME Soybean Futures," Business School Working Papers 2012-01, Universidad Torcuato Di Tella.
    14. Back, Janis & Prokopczuk, Marcel & Rudolf, Markus, 2013. "Seasonality and the valuation of commodity options," Journal of Banking & Finance, Elsevier, vol. 37(2), pages 273-290.

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