Chemingui and Dessus (1999) and Chemingui (2007) tested the influence of changing the values for international trade substitution elasticities as well as substitution elasticities between fixed and mobile factors. For trade elastici- ties, halved values for imports and exports are tested. This cut in substitut- ability between domestic and foreign products reduces the magnitude of the impact of a cut in tariffs, but consumers do not turn toward foreign products. When substitution elasticity between capital and labor and between different types of capital (physical and land) are doubled, the cost of trade liberaliza- tion is lower, but the direction of the impact does not change.