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In this paper, we study supplier-firm interactions to explain firms' outsourcing relationships. We show that in an imperfect information setup a firm learns about the quality of its suppliers through repeated interaction. As the firm determines the suppliers' quality with greater precision, it gives a greater proportion of its contracts to these ‘better’ suppliers. We report evidence from African manufacturing firms that is consistent with our hypothesis: both frequency and volume of transactions increase with the length of a firm's relationship with its supplier. These effects are stronger in poor contracting environments. [ABSTRACT FROM AUTHOR]