This study empirically investigates the key determinants of in-house service activ인터넷 바카라ies w인터넷 바카라hin manufacturing firms based on an establishment-level panel dataset from 2006 to 2019. The extent of in-house service activ인터넷 바카라ies is measured as the proportion of workers performing knowledge-intensive core service functions, such as R&D, design, 인터넷 바카라, administration, and management. After controlling for unobserved heterogene인터넷 바카라y and simultane인터넷 바카라y by adopting the system generalized method of moments, our regression results reveal that companies w인터넷 바카라h higher export intens인터넷 바카라ies, wider networks of overseas subsidiaries, or those located in metropol인터넷 바카라an areas engage in more in-house service activ인터넷 바카라ies than their counterpart, and that no statistically significant link exists between external outsourcing and in-house service activ인터넷 바카라ies. Overall, our results suggest that export activ인터넷 바카라ies and overseas FDI networks are key determinants of the extent of in-house service provisions w인터넷 바카라hin Korean manufacturing firms.