世界银行：中低收入国家的国内贸易成本（英文版）

International trade costs have fallen drastically in the last decades. However, intra-national (i.e. within-country) trade costs still remain high in low- and middle-income countries. Quantifying trade costs and their components is crucial since lower trade costs can increase efficiency, improve the welfare of households and firms, and drive structural transformation through increased trade opportunities (Sotelo, 2019; Fajgelbaum and Redding, 2014; Costinot and Donaldson, 2016). By understanding