Most people think of Costco as a warehouse. They think of bulk groceries, the legendary $1.50 hot dog, $4.99 rotisserie chicken, and the particular domestic satisfaction of a cart loaded with household essentials at prices that make the annual membership feel like one of the smartest financial decisions they have ever made. What far fewer of those same members realize — and what makes the Costco value ecosystem so much deeper and so much more commercially interesting than it