The paper investigates, in a non-technical fashion, the economic determinants of interchange fees in payment card systems and the potential need for their regulation. Among other things, it demonstrates that the proposal for a cost-based regulation of interchange fees relies on an erroneous,...

The paper offers a roadmap to the current economic thinking concerning interchange fees. After describing the fundamental externalities inherent in payment systems and analysing merchant resistance to interchange fee increases and the associations' determination of this fee, it derives the...