I once saw a vending machine in Japan with a 200ml Coca-Cola, a 300ml Coca-Cola, a 500ml Coca-Cola and a 800ml Coca-Cola. Each one cost ¥120.
I was perplexed. I couldn't imagine paying ¥120 for 200ml of something when they could get more (four times more!) of the same stuff for the same price from the same place.
Just then, I looked over at Mika at the next vending machine. She was buying a 200ml Coke.
"Why are you buying the 200ml one‽" I inquired, shocked. "You could have 800ml for the same price!"
Mika thought for a second and replied, "I only want 200ml of Coke."
I just posted a short review of a slightly related study on the Science That Matters blog.
