This article studies the effects of international and intranational knowledge flows. Contributions include comparing the effects of knowledge flows on the formal and informal sectors and determining multilateral spatial spillovers of innovation. Results show that formal entrepreneurs respect intranational intellectual property rights, but benefit from international spillovers, especially from patents granted. In contrast, informal entrepreneurs somewhat respect intranational patents granted, but not patent applications and citations. International spillovers to the informal sector are mainly from patents granted. Spillover magnitudes are greater internationally than intranationally, and greater in the informal sector than the formal sector (except for trademarks). (JEL O33, L26, K42)