We have one supermarket in our little town. Are they required to display unit prices?

‘I’d suggest approaching the IGA’s owner with a view to advocating for their participation in the unit pricing scheme on a voluntary basis,’ policy expert Kat George writes. Photograph: the_burtons/Getty Images

We have one supermarket in our little town, an IGA. It is very expensive. They do not display the unit price on food items. Fruit and veg, yes, but other items no. Are they legally required to?

– Christine, New South Wales