Alex Xu on Twitter: "/1 Why is the credit card called "𝐭𝐡𝐞 𝐦𝐨𝐬𝐭 𝐩𝐫𝐨𝐟𝐢𝐭𝐚𝐛𝐥𝐞 product in banks"? How does VISA/Mastercard make money?The diagram below shows the economics of the credit card payment flow.1. The cardholder pays a merchant $100 to buy a product. pic.twitter.com/RjFKhoV7P6 / Twitter"

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