Interesting info and highlights how powerful Costco has become. They continue to capture revenue streams outside of margin from actually selling goods (credit card bounties/rev-share, membership fees, etc.) and they presumably were able to get Visa/Citi to lose money on this deal. Visa set interchange fees at less than 0.4% (vs. 0.6% I believe for the old Amex deal).

http://www.bloomberg.com/news/articles/2015-04-17/costco-see...