The Internet phenomenon has rewritten the rules for doing business, changing many business models beyond recognition. New ways of business require new ways of describing them. One new rule of thumb is the "1% rule," which states that in a community of 100, one member creates new content, 10 others interact with it, and 89 just "consume" it. Thus, adoption or uptake of a new cultural phenomenon requires a critical mass of only 1%. (Witness the worldwide success of YouTube.) This TowerGroup Research Note gives evidence that just 1% of European banks will determine the future of the European ACH business and suggests how processors and banks should prepare for this eventuality.