Vol. I. Part I. Theory of trade costs -- Part II. Empirical evidence : data and global view of transactions costs. How do trade transaction costs matter in general? -- Recent detailed evidence on the prevalence of transaction costs -- Empirical evidence : Ex Ante assessment and computable general equilibrium modeling -- Time factors. Vol. II. Part I. Linkages between trade transaction costs, trade and economic development : selective evidence. Telecommunication services -- Transport services -- Trade finance and connection to international supply chains -- Customs : pre-shipment inspection and security -- Trade standards -- Part II. Institutional and political economy dimensions.