In recent years, some Canadian politicians and powerful interest groups have issued increasingly vocal calls for dramatic regulatory interventions into the country's payment cards system. In particular, they have called for a "hard cap" price-controls on interchange fees, a ban on contractual...

The Durbin Amendment to the Dodd-Frank financial reform legislation capped debit card interchange fees for banks with assets of $10 billion. Credit card and prepaid card interchange fees were not regulated. The cap, which took effect on October 11, 2011, cut the average interchange fee for...