This section presents the demand elasticities used in the models that appear in Chapters 3 and 4. In Table A1 (direct elasticities), the diagonal shows the elasticities of own commodities; the off-diagonal entries show the elasticities for imported commodities. We do not impose elasticities on the Centrally Planned Economies since imports to these countries are determined exogenously. The elasticities of Table A1 are defined as