The American economy: colonial days through the civil war. Development of an advanced economy: 1870-1960. Economic interdependence and iterregional trade. Market price in an exchange economy. Price equilibrium in spatially separated markets. Sapace and transfer cost. Markets with sapatially disperser production. Efficient organization within market areas. Price equilibrium with alternative product forms. Multiple product forms and sapatially separated markets. Temporal market price relationships. Priece discrimination among markets. Nonprice factors affecting trade. Short-run trade flows. Regional production. Land use equilibrium models. Spatial equilibrium with mobile resources. General equilibrium in an Isolated region. Multiple production and trade models. Efficiency in marketing