International Business research has focused attention on the role of the home country in firm internationalization. While this has produced insights as to how home countries condition firm internationalization, significant gaps remain. We focus on two. First, research on how and why countries differ in their internationalization support is limited. Second, research on how countries differ in the extension of their internationalization support into host countries is scant. Addressing these gaps, we develop a conceptual paper and put forward nine propositions. We theorize how differences in the dominant mode of economic coordination in home countries – in market-, business-, and state-led economies – relate to variation in their internationalization support. Our framework is relevant to developed and emerging economies.