In Canada I think they are legally required to, but sometimes it can be frustrating if they don’t always compare like units - one product will be price per gram

In Canada I think they are legally required to, but sometimes it can be frustrating if they don’t always compare like units - one product will be price per gram or 100 grams, and another price per kg. I’ve found with online shopping, the unit prices don’t take into account discounts and sale prices, which makes it harder to shop sales (in store seems to be better for this).