Causality and Efficiency in the Coffee Futures Market
Tests for causality and rationality in the coffee futures market were carried out using data from the New York Market. Tests of causality indicated that futures prices strongly influence variations in spot price eight weeks or more to maturity. However, beginning seven weeks to maturity there seems to be a strong causal relationship going from futures to spot and from spot to futures. Risk constancy or neutrality, equality of risk premium and spot price, and efficiency were rejected for the period 18, 51, and 33 weeks or more to maturity. However, simultaneity of risk neutrality and efficiency was accepted for contracts with 55-77 weeks to maturity. The general conclusion from this study is that coffee futures market can be used as an indicator of spot market prices for contracts with 55-77 weeks to maturity. While benefits can be obtained through short term adjustment of available stock and making use of quality storage facilities, planning longer term planting and marketing decisions (e.g., ≥ 77 weeks) on the basis of futures market price can result in misallocation of resources and welfare loss.
|Date of creation:||06 Mar 1992|
|Date of revision:||1992|
|Publication status:||Published in Journal of International Food & Agribusiness Marketing 1.5(1993): pp. 55-71|
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Web page: http://mpra.ub.uni-muenchen.de
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- Stein, Jerome L, 1980. "The Dynamics of Spot and Forward Prices in an Efficient Foreign Exchange Market with Rational Expectations," American Economic Review, American Economic Association, vol. 70(4), pages 565-83, September.
- Granger, C W J, 1969. "Investigating Causal Relations by Econometric Models and Cross-Spectral Methods," Econometrica, Econometric Society, vol. 37(3), pages 424-38, July.
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