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This paper argues that due to the payment of fringe benefits and the effect of labour legislation entitling workers to non-wage benefits the observed hourly wage is an underestimate of the actual return to labour. Furthermore, as the proportion of total wage comprising fringe benefits increases with hours worked there is a spurious negative relationship between weekly hours and the average hourly wage rate. This is contaminated by the selection bias from individuals optimizing over hours and wage rates. We derive the conditional empirical wage\hours profile while adjusting for the possible endogeneity of hours worked to the wage rate. Our results indicate that the hourly gross wage rate is inversely related to weekly hours worked making the estimation of an upward sloping labour supply curve improbable.