世界银行：非洲公路网的最佳投资（英文版）

This paper characterizes economically optimal investments in Africa’s road network in partial and general equilibrium —based on a detailed topography of the network, road con-struction costs, frictions in cross-border trading, and economic geography. Drawing from data on 144 million trans-continental routes, it first assesses local and global network efficiency and market access. It then derives a large network connecting 447 cities and 52 ports along the fastest routes, devises an algorithm