on gravity modeling and estimation for international trade and migration and on domestic firm-level labor market effects … distance coefficient increases over time when standard estimators are used, while a non-linear estimation of the newly … developed estimation leads to a decline in the distance coefficient over time. This shows that the distance puzzle, thus, arises …

world. Some of these papers are "classic" empirical studies that helped to shape the field of microeconometrics in … on Germany, the third-largest exporter and importer of goods in the world." …