What Determines the Scope of the Firm Over Time? A Focus on Institutional Relatedness

“What determines the scope of the firm?” is one of the most fundamental questions in strategic management. We argue that, in addition to product relatedness, a focus on institutional relatedness—defined as an organization's informal linkages with dominant institutions that confer resources and legitimacy—helps answer this question. We address this question both longitudinally (firms in developed and emerging economies over time) and cross-sectionally (developed versus emerging economies), thus contributing to an institution-based theory of corporate diversification.