Price response of maize acreage in Benin was estimated with a particular emphasis on whether the prices were producer prices in rural markets or retail prices in urban markets. A second difference between prices was examined through a price adjustment model which takes into account the distortions caused by local units on maize price when one is concerned with the pricing system in the private marketing network relating rural and urban areas. Urban market price specification appeared to be the most relevant statistically in explaining acreage decisions in Mono province. Price elasticity of acreage was 0.445 in this area while its value, around 0.10, was not significant for Benin as a whole. The use of adjusted urban prices enabled an increase of 5.6% of the elasticity in Mono province. The urban vs. rural difference was apparent, but the coefficients of the price variable were not significant in equations with rural prices. The latter were not as reliable as those of the urban market of Dantokpa (in Cotonou city) collected by the Institute of Statistics (INSAE) and the GTZ project.