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Using a linked employer-employee panel, we seek to identify corporate practices. We focus on the dissemination of knowledge in the firm. By formulating a precise definition of the firm-specific effect, we link it to the concept of wage efficiency. Human-capital externalities are therefore analyzed at a microeconomic level. We elaborate a stochastic parametric wage-frontier model (Battese and Coelli, 1995). A firm is efficient if it maximizes human-capital transmission. This procedure allows a simultaneous estimate of the wage frontier and the determinants of efficiency. The results show the role of both intra - and inter-organizational characteristics in determining wage efficiency.