Price Explosiveness, Speculation, and Grain Futures Prices

23 Pages Posted: 15 Apr 2020

See all articles by Xiaoli Etienne

Xiaoli Etienne

West Virginia University - Division of Resource Management

Scott H. Irwin

University of Illinois at Urbana-Champaign

Philip Garcia

University of Illinois at Urbana-Champaign - Department of Agricultural and Consumer Economics

Date Written: January 2015

Abstract

A recently developed testing procedure is used to detect and date‐stamp explosive episodes (“bubbles”) in corn, soybean, and wheat futures markets during 2004–2013. We find that the markets experienced price explosiveness only approximately two percent of the time and, when bubbles do occur, they are generally short‐lived and small in magnitude. The correspondence between observed price spikes and bubbles is rather low, with a large portion of the price explosiveness occurring during downward price movements. Commodity index trader positions do not significantly affect the probability of a positive bubble occurring in grain futures markets, which directly contradicts the argument (the “Masters Hypothesis”) that waves of index investment distorted underlying supply‐and‐demand relationships and led to a series of massive bubbles in agricultural futures markets. In addition, commodity index trader positions tend to reduce negative bubble occurrence, while general speculative activity as measured by Working's T reduces the probability of a positive bubble. There is some evidence that the positions of noncommercial traders have a direct effect on positive bubble occurrence, but the effect declines when accounting for the composition of other traders in the market. Overall, speculation has little effect or negative effects on price explosiveness. Finally, positive bubbles are more likely to occur in the presence of low inventories, strong exports, a weak U.S. dollar, and booming economic growth, whereas negative bubbles are more likely to occur with large inventories, weak exports, and stagnant economic growth.

Keywords: Bubbles, price explosiveness, futures market, grain, index investment, price impact

Suggested Citation

Etienne, Xiaoli and Irwin, Scott and Garcia, Philip, Price Explosiveness, Speculation, and Grain Futures Prices (January 2015). American Journal of Agricultural Economics, Vol. 97, Issue 1, pp. 65-87, 2015, Available at SSRN: https://ssrn.com/abstract=3574224 or http://dx.doi.org/10.1093/ajae/aau069

Xiaoli Etienne (Contact Author)

West Virginia University - Division of Resource Management ( email )

Morgantown, WV 26506
United States

Scott Irwin

University of Illinois at Urbana-Champaign ( email )

344 Mumford Hall
1301 W. Gregory Dr.
Urbana, IL 61801
United States
217-333-6087 (Phone)

HOME PAGE: http://https://scotthirwin.com/

Philip Garcia

University of Illinois at Urbana-Champaign - Department of Agricultural and Consumer Economics ( email )

1301 W. Gregory Drive
427 Mumford Hall
Urbana, IL 61801
United States
217-333-0644 (Phone)
217-333-5538 (Fax)

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