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Are New Crop Futures and Option Prices for Corn and Soybeans Biased? An Updated Appraisal

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  • King, Katie
  • Zulauf, Carl

Abstract

This study revisits the debate over whether a bias exists in new crop December corn and November soybean futures and option prices. Some evidence of bias is found in December corn futures and December corn puts, but the evidence is substantially muted when transaction costs are included. The study also examines if information contained in the widely-followed World Agriculture Supply and Demand Reports (WASDE) issued by the U.S. Department of Agriculture as well as the implied volatility from new crop corn and soybean options are incorporated efficiently into December corn and November soybean futures prices. Previous studies have examined the immediate incorporation of public information into futures prices. This study examines whether public information is incorporated efficiently from the perspective of the change in price between the first non-limit close following the release of a WASDE report and the first contract delivery day. The May WASDE is the first release of the calendar year to include estimates of the forthcoming new crop year’s supply and demand. For both the December corn and November soybean regressions, the intercept, change in stocks-to-use ratio between the current and new crop year reported in the May WASDE, and option market implied volatility are significantly different than zero at the 95 percent confidence level. The current crop year’s stocks-to-use ratio is not statistically significant. These results held in general for both the May and June WASDE releases, although some sensitivity occurred when the May future rather than as a direct confrontation to the theory of market efficiency.

Suggested Citation

  • King, Katie & Zulauf, Carl, 2010. "Are New Crop Futures and Option Prices for Corn and Soybeans Biased? An Updated Appraisal," 2010 Conference, April 19-20, 2010, St. Louis, Missouri 285327, NCR-134/ NCCC-134 Applied Commodity Price Analysis, Forecasting, and Market Risk Management.
    • Handle: RePEc:ags:nccc10:285327
    DOI: 10.22004/ag.econ.285327
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    References listed on IDEAS

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