This dissertation was prepared as a collection of 4 research articles in the field of international trade with a focus … on gravity modeling and estimation for international trade and migration and on domestic firm-level labor market effects … trade with endogenous international migration choices of workers. We use the model for an ex ante comparative static welfare …

international trade and are widely cited. The two final papers are hitherto unpublished and include new material. Applications focus …"Microeconometric Studies of Firms' Imports and Exports spans twenty-four papers with a focus on four topics …-country studies using comparable data for firms; studies of exports by business services firms; and new evidence on German firms …