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By considering the heterogeneity of the labour force, uncertainty about performances, and risk and inequality aversion, and by applying a skill-wise optimal-control method, an efficient rule for allocating salary loadings in a regulated place of employment is derived. This rule indicates that salary loadings may vary monotonically, but not necessarily increase, with skill. Only when the marginal costs of risk-bearing and inequality are smaller than the expected marginal performance, loadings should monotonically increase with skill.