هزینه های حمل و نقل و خوشه های تجارت : برخی شواهد تجربی از حوزه های آداب و رسوم

The paper first presents and discusses the average costs of transporting imports for each of eight sample customs districts. These estimates of transportation costs are derived from documents that require importers to report the value of imports and the cost of freight and insurance. Next, measures of concentration and similarity such as Herfindahl-Hirschman and Grubel-Lloyd indices are constructed and related to trade clusters. These measures are used in fixed-effects regressions for transportation costs, and the results suggest that trade cluster effects matter. The paper concludes with a discussion of policy implications that follow from the regression findings.