Abstract
Does the common currency promote goods market integration within the EMU? We argue that such an effect is likely, but that the mechanism typically proposed-lower costs of arbitrage because of increased price transparency-is likely to be of minor importance. Instead we sketch a duopoly model which stresses that lower possibility of future real exchange rate variability lowers the option value of being able to price discriminate. The euro would promote market integration because it is less valuable for firms to segment markets. In addition we argue that fairness concerns and less risk associated with third party arbitrage may be potentially important.