"Recognize that reducing friction dramatically increases spending The shift from magnetic stripe to chip-and-PIN, while cutting UK counterfeit fraud by 63 percent, added roughly 10 extra seconds per transaction — and across the entire US economy that translated to an estimated 116 million extra hours spent waiting at cash registers every year. The narrator notes that "one-click checkouts online can increase spending by almost 30 percent," illustrating that even tiny amounts of added friction have massive effects on consumer behaviour in the opposite direction. Understanding this dynamic helps anyone designing a checkout flow, a donation page, or a subscription funnel make better tradeoffs between security and conversion. The lesson: every second of friction you add or remove has compounding economic consequences far beyond what feels intuitive. Source: Derek Muller, Veritasium, How Your Credit Card Works — and How It's Being Hacked"