- A Appendix: Supplementary Tables [Intended for online posting only] In this appendix, we provide supplementary tables on a variety of alternative specifications to test the robustness of the results obtained in the baseline regressions. Tables 8 and 9 present regressions similar to the four base-case regressions displayed in Tables 2 and 3, but for the year 2018. Tables 10 through 15 present gravity models for sectoral disaggregations based on alternative measures. Tables 16, 17, 18 and 19 presents alternative models with import-based and commonality measures. Finally, Tables 20, 21, 22, and 23 present expanded models in which we add additional indicator variables to the base specification, particularly for Paris as a special case and for the presence of a foreign border, a sea border, or both.
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