Ironware economics A customer in a hardware shop asks: "How much do I pay for one?" "Three euros", the shopkeeper replies. "And what about twelve?" is his next question, to which the shopkeeper answers: "That would be six euros." "OK, then I'll take a hundred and twenty-one." the customer says and pays nine euros. The question is: What did this customer buy? Take your time to think before looking at the solution here Back to riddle-page Homepage in English Homepage in Dutch