Introduction. -- Getting started with GAMS. -- Utility maximization. -- Cost minimization. -- Long-run production. -- Short-run production. -- Dual approach. -- Transition. -- Higher dimensions. -- Intermediate inputs. -- Autarky. -- Small country trading equilibrium. -- Non-Traded Goods. -- Large country trading equilibrium. -- Two country trading equilibrium. -- Higher dimensions and trade. -- Reciprocal dumping. -- Monopolistic composition. -- Tariffs and other trade interventions. -- Domestic taxes and subsidies. -- Factor market distortions. -- Multiple households and other sources of demand. -- Armington preferences. -- Joint production. -- Social accounting matrices. -- Closure. -- Single country competitive CGE. -- Concluding comments.