Why 'Free Refills' Only Really Exist In America, And What It Does To Your Brain

Tourists are stunned by it. Economists are fascinated by it. You just call it lunch.

Visitors to the U.S. regularly report the same culture shock: you can just... keep refilling your drink? Forever? For free? Yes. Welcome.

The economics make it possible. Fountain soda costs restaurants pennies per cup, so unlimited refills are a cheap way to make a meal feel generous.

The psychology makes it powerful. 'Free' anything triggers an outsized sense of value, and a bottomless cup makes the whole restaurant feel abundant.

The side effect is that Americans learned to sip continuously through entire meals, a habit much of the world finds baffling. The cup is never empty. That's the point.