Media type: E-Article Title: Gravity and Friction: The Micro Foundations of Trade Costs Contributor: Aguiar, Víctor Hernán; Martin-Mayoral, Fernando Published: Elsevier BV, 2009 Published in: SSRN Electronic Journal (2009) Language: English DOI: 10.2139/ssrn.1458167 ISSN: 1556-5068 Keywords: Pharmacology (medical) Origination: Footnote: