Patrick McKenzie (patio11) reads his Bits about Money essay on how credit cards make money. The prompt was a listener who wondered how a card can include free travel insurance for someone who never carries a balance. He covers the four ways a card earns revenue (net interest, interchange, fees and marketing contributions), and explains why rewards competition makes some customers in the middle of the credit score ladder persistently unprofitable. He also explains why Europe's interchange cap left cards at about half of electronic payments, while Japan's uncapped interchange quietly pays for the rest of its consumer banking. In a new postscript, he walks through what a proposed 10% APR cap would mean for cardholders at the low end of the market, and how First Republic made sub-10% unsecured loans work by treating them as a way to win deposits.

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Full transcript available here: https://www.complexsystemspodcast.com/why-banks-pay-you-to-use-their-credit-cards/

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Presenting Sponsors: Mercury & Granola

Complex Systems is presented by Mercury—radically better banking for founders. Mercury Spend hands your team and agents their own cards with limits you set once, so nobody waits on you to approve a SaaS invoice and nobody chases a receipt. Apply online in minutes at https://mercury.com/.

If meetings consistently leave you with hazy action items and lost context, Granola handles the transcription so you can actually participate and gives you searchable notes afterward. Try it free at granola.ai/complexsystems with code COMPLEXSYSTEMS

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Links:

• How credit cards make money: https://www.bitsaboutmoney.com/archive/how-credit-cards-make-money/

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Timestamps:

(00:00) Intro
(01:11) How credit cards make money
(01:55) Bundling and unbundling
(03:12) Revenue levers for credit cards
(03:23) Net interest
(06:19) Interchange
(07:34) Interchange makes cards so valuable you're paid to use them
(10:02) Fees
(10:50) Marketing contributions
(13:05) Debit cards: a horse of a different color
(13:32) Sponsors: Mercury | Granola
(16:54) Postscript
(25:27) Wrap