Any time there’s a long queue at a coffee shop/dock, espressos (and americanos) are too expensive relative to milk drinks like cappuccinos and lattes.
If there’s a long queue, the bottleneck on revenue is the speed at which drinks can be made by baristas. Cappuccinos take forever to make relative to a simple espresso. So, why not make espressos and americanos (and teas) at least ~25% cheaper, not just $0.10 or $0.20 cheaper?
As from now, the following formula shall define a “Milk Spread” – with thanks to my friend Greg for the term “Milk Spread”:
Milk Spread = (Price Cappuccino – Price Americano)/(Price Cappuccino)
Typical values are in the range of 7%, but should be 25%+ imo.