In-N-Out: The Limited-Menu Throughput Model

In-N-Out has roughly four things on its menu: burgers, fries, drinks, shakes. No chicken sandwiches, no breakfast, no seasonal specials, and almost no change in decades. Founded in California in 1948 by Harry Snyder, it makes burgers fresh rather than pre-made, which should mean slow service, yet the lines move and the loyalty is fierce. The famously long queues aren't a flaw in the model. They're evidence it works.

This case is about the counterintuitive power of refusing to expand, when every instinct and every competitor says more options mean more revenue. For founders and operators, it sharpens one of the hardest calls in the business: what to add, what to kill, and how much hidden coordination cost, training burden, and quality risk each new line item drags in behind it. The discipline to stay narrow is rarer than it looks.