(19)The impact assessment shows that a prohibition of interchange fees for debit card transactions would be beneficial for card acceptance, card usage, the development of the single market and generate more benefits to merchants and consumers than a cap set at any higher level. Moreover, it would avoid negative effects resulting from a higher cap in those national schemes that have very low or zero interchange fees for debit transactions due to cross-border expansion or new market entrants increasing fee levels to the level of the cap. A ban on interchange fees for debit card transactions also addresses the threat of exporting the interchange fee model to new, innovative payment services such as mobile and online systems.