Bayesian Estimation of the Storage Model using Information on Quantities

OCP Policy Center, Rabat

In this presentation, Mr. Christophe Gouel will discuss his paper entitled “Bayesian Estimation of the Storage Model using Information on Quantities”. This paper presents a new strategy to estimate the rational expectations storage model. It uses information on prices and quantities – consumption and production – in contrast to previous approaches which use only prices. This additional information allows to estimate a model with elastic supply, and to identify parameters such as supply and demand elasticities, which are left unidentified when using prices alone. The estimation relies on the Bayesian methods popularized in the literature on the estimation of DSGE models. It is carried out on a market representing the caloric aggregate of the four basic staples – maize, rice, soybeans, and wheat – from 1961 to 2006. The results show that to be consistent with the observed volatility of consumption, production, and price, elasticities have to be in the lower ranges of the elasticities in the literature, a result consistent, according to the authors, with recent instrumental variable estimations on the same sample.