An Original Contribution to the Theory of Ethnic Diversity and Economic Development in African Federations

The relationship between ethnic diversity and economic development is theoretically and empirically contested, with Africa providing a particularly rich context for analysis, and developing an original theoretical contribution that distinguishes between diversity types and developmental contexts in African federations constitutes a significant original advance. This study developed an original theory of ethnic diversity and economic development in African federations, with particular empirical grounding in Nigeria. A constructive theoretical methodology combining systematic review of 94 ethnic diversity-development publications from 2018 to 2024, development of an original conceptual model, and empirical testing across Nigeria's 36 states and FCT was employed. Systematic review confirmed that existing diversity indices (fractionalisation, polarisation) inadequately captured the institutional context-dependent nature of diversity effects, the distinction between cultural diversity, political ethnic competition, and economic ethnic stratification as distinct mechanisms, and the heterogeneous effects of diversity at different geographic scales. Original empirical panel regression using within-state variation in ethnic fractionalisation, economic outcomes, and institutional quality measures confirmed that ethnic fractionalisation was associated with lower public goods provision (beta = -0.34, p < 0.01) through lower IGR and higher expenditure patronage orientation. However, ethnic diversity showed positive innovation and market diversity effects at the local government level. The original framework proposes a three-mechanism model distinguishing political, public goods, and market effects of diversity with institutional quality as the primary moderator. Expert review confirmed the framework's original contribution. Keywords: ethnic diversity, economic development, African federations, Nigeria, original theory