Starbucks Economics - Solving the mystery of the elusive "short" cappuccino. By Tim Harford

Starbucks Economics - Solving the mystery of the elusive "short" cappuccino. By Tim Harford: "Here's a little secret that Starbucks doesn't want you to know: They will serve you a better, stronger cappuccino if you want one, and they will charge you less for it. Ask for it in any Starbucks and the barista will comply without batting an eye. The puzzle is to work out why.

The drink in question is the elusive 'short cappuccino'—at 8 ounces, a third smaller than the smallest size on the official menu, the 'tall,' and dwarfed by what Starbucks calls the 'customer-preferred' size, the 'Venti,' which weighs in at 20 ounces and more than 200 calories before you add the sugar.

The short cappuccino has the same amount of espresso as the 12-ounce tall, meaning a bolder coffee taste, and also a better one. The World Barista Championship rules, for example, define a traditional cappuccino as a 'five- to six-ounce beverage.' This is also the size of cappuccino served by many continental cafés. Within reason, the shorter the cappuccino, the better."