Do you pay attention to unit prices at the shops?

Maybe you even know the exact time your local supermarket discounts things so you can swoop in and grab a bargain.

What if supermarkets started using those same tactics on you? With the rollout of electronic shelf labels — those little digital screens replacing paper tags — prices can be updated instantly at the push of a button.

It's becoming more widespread in Australia, and although it's not inherently problematic, some are concerned that the way it's being used overseas could have implications for Australian shoppers.