Demand Uncertainty and Excess Supply in Commodity Contracting

33 Pages Posted: 27 Jan 2012

See all articles by Dana Popescu

Dana Popescu

INSEAD - Technology and Operations Management

Sridhar Seshadri

University of Illinois at Urbana Champaign; Indian School of Business

Date Written: January 27, 2012


We examine how different characteristics of product demand and market impact the relative sales volume in the forward and spot markets for a commodity whose aggregate demand is uncertain. In a setting where either the forward contracts are binding quantity commitments between buyers and suppliers or the forward production takes place before the uncertainty in demand is resolved, we find that a combination of factors that include market concentration, demand risk and price elasticity of demand, will determine whether a commodity will be sold mainly through forward contracts or in the spot market. Previous findings in the literature show that when participants are risk neutral, the ratio of forward sales to spot sales is a function of market concentration alone and the lower the concentration, the higher the ratio. These findings hold under the assumption that demand is either deterministic or, if demand is uncertain, all production takes place after uncertainty is fully resolved and production plans can be altered instantaneously and costlessly. In our setting, however, we find that even a low level of demand risk can completely reverse the nature of supply in a highly competitive (low concentration) market, by shifting it from predominantly forward driven to spot driven supply. In markets with high concentration, it is the price elasticity of demand that will determine whether the supply will be predominantly spot driven or forward driven. Our analysis suggests various new hypotheses on the structure of supply in commodity markets.

Keywords: Forward and Spot Market, Excess Supply, Speculators, Cournot Competition

Suggested Citation

Popescu, Dana and Seshadri, Sridhar, Demand Uncertainty and Excess Supply in Commodity Contracting (January 27, 2012). INSEAD Working Paper No. 2012/13/TOM, Available at SSRN: or

Dana Popescu (Contact Author)

INSEAD - Technology and Operations Management ( email )

Boulevard de Constance
77 305 Fontainebleau Cedex

Sridhar Seshadri

University of Illinois at Urbana Champaign ( email )

1206 South Sixth Street
Champaign, IL 61820
United States

Indian School of Business ( email )

Hyderabad, Gachibowli 500 019

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