Walk down any supermarket aisle, and you will find brightly colored boxes and bold labels shouting terms like “Family Size,” “Mega Pack,” or “Value Size.” Consumers are conditioned to believe that buying larger quantities automatically translates to a lower cost per serving. We toss the oversized cereal box or the giant container of laundry detergent into our carts, assuming we are outsmarting inflation. However, consumer research reveals that larger packaging is frequently a marketing illusion. Trusting the words on the front of the box can quietly cost you extra money.