Text: Once all European prices are quoted in euros, it will be obvious to consumers when a German company is charging more than its French competitor or vice versa--whereas it wouldn't be if the prices were quoted in francs and marks and had to be converted at the going exchange rate.
Entailment: Quoting all European prices in Euros would reveal trading discrepancies.
Contradiction: Once European prices are showed in euros, you can see German companies cost less than French.