PM - Supermarket offers: Bigger doesn't mean cheaper - ÃÛÑ¿´«Ã½ Sounds

PM - Supermarket offers: Bigger doesn't mean cheaper - ÃÛÑ¿´«Ã½ Sounds
Supermarket offers: Bigger doesn't mean cheaper
Professor Bernhard von Stengel explains how some supermarkets calculate their deals.