I introduce an alternative parameter-based definition of component- and headquarter-intensive sectors into the seminal model of global sourcing by Antràs and Helpman (2004, JPE). This approach overcomes problems of the original sector definition like counter intuitive classifications or...

This paper formulates a weighted regression approach to analyze the impact of dynamic MAR- and Jacobs-externalities on local employment growth in Germany between 1993 and 2001. We find that Jacobs-externalities matter both in manufacturing, and service industries. MAR-externalities are present...

This paper formulates a weighted regression approach to analyze the impact of dynamic MAR- and Jacobs-externalities on local employment growth in Germany between 1993 and 2001. We find that Jacobs-externalities matter both in manufacturing, and service industries. MAR-externalities are present...