"This paper develops a new approach for investigating the determinant of the mark-up of prices over costs. We estimate basic price equations around an expression for marginal cost that is derived from a cost minimisation problem, using a vector error correction approach to avoid endogeneity bias. Observed basic prices include the mark-up over marginal costs, and this mark-up is of interest to policymakers as an indicator of competition and ultimately as a determinant of the level of equilibrium employment. We look at the factors driving this mark-up, and in particular look at the role of EMU, as well as globalisation, the European Single Market and openness to trade and the introduction of the euro. We use a panel data set that includes both EMU and non-EMU members. The results indicate an important role for trade liberalisation in determining the mark-up, but openness itself and the introduction of the euro do not appear to have a significant role."

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