Border Union Railway | Border Counties Railway | border | border crossing | United States Border Patrol | Canada–United States border | U.S. Customs and Border Protection | Mexico–United States border | Allan Border | ITV Border | David McCallum | Border | Australian Customs and Border Protection Service | Super Puzzle Fighter II Turbo | King's Own Royal Border Regiment | Western Australia border | John McCallum | Border Security: Australia's Front Line | Anglo-Scottish border | Timothy Parker (puzzle designer) | The Border | Tajik Border Troops | puzzle | Paul McCallum | Inner German border | Canada Border Services Agency | Border Reivers | Border Collie | border checkpoint | the border |
Bridging economic theory with empirical tests, James Anderson and Jeffrey Bergstrand develop econometric models, grounded in the theories of differentiated goods, which measure the gains from trade liberalizations and the magnitude of the border barriers on trade (see McCallum Border puzzle).