Katherine goes into the new Priceline Pharmacy at South Eveleigh during her lunch hour. She is looking for a gift for her niece who will be five years old next week. She picks up a small basket and makes her way around the store. She takes some items from the shelves and puts a brush, some hairbands and some bubble bath in her basket. Then she sees a music box and realises that the music box is the perfect gift for her niece.

Katherine is not sure what to do. Is she legally allowed to put back the items that are already in her basket, or has a contract been formed when she took the items from the shelf and put them in the basket? Explain how the rules of offer and acceptance work in relation to a self-service store