Dear Economist,
A single Milky Way costs 20p in my local corner shop. A twin pack costs 47p. I’ve made a habit of checking the prices in other shops and a twin pack invariably costs more than two singles. What could be the cause of this apparent madness?
The madness in pricing, that is, not the madness of a twenty-something compulsively checking the price of children’s sweets.
Kendrick Curtis, via e-mail