Trader Joe's breaks every rule of modern retail. They don't do e-commerce. They don't do delivery. No sales, coupons, or loyalty programs. They only stock 4,000 SKUs versus 50,000+ at normal supermarkets. Their parking lots are famously terrible and they're constantly out of your favorite items. Shoppers brave long lines and cramped aisles while overly-friendly employees in Hawaiian shirts try to chat them up. Everything about the Trader Joe's experience seems designed to drive modern consumers away. And yet they generate $2,000+ per square foot in sales — double their nearest competitor in Whole Foods and nearly 4x the industry average — and Americans are...