A handful of companies now control which products get shelf space, how prices are set, and what you think you're choosing when you walk down the cereal aisle — and a wave of supermarket mergers is about to make that leverage nearly invisible. This week, we get into the mechanics of slotting fees, category captains, and why the Kroger-Albertsons deal was about far more than groceries. The system shaping what America eats is hiding in plain sight.