The aim of this paper is to evaluate critically four competing theories that variously explain informal sector entrepreneurship as a traditional activity that has not yet been incorporated into the modern system (modernization theory), a form of production integral to contemporary capitalism conducted by marginalized population groups as a survival strategy (structuralist theory), a voluntarily chosen endeavor and popular reaction to excessive regulation by the state (neo[Formula: see text]liberal theory) or a voluntarily chosen practice conducted for social, redistributive, political resistance or identity reasons (post-structuralist theory). Reporting the results of face[Formula: see text]to[Formula: see text]face interviews with 215 informal entrepreneurs in Zamfara, a tropical region in Nigeria, the finding is that no one theory is universally valid. Instead, each theory is valid in relation to different groups of entrepreneur and only by combining all of them can a finer-grained and more nuanced explanation of the complex and heterogeneous character of informal sector entrepreneurship be achieved.

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Making Headway: the introduction of Western civilisation in colonial northern Nigeria. Rochester NY: University of Rochester Press (hb £66 -978 1 58046 299 0). 2009, 352 pp.

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