Rival supermarkets, including Sainsbury’s, Tesco, and Morrisons, have developed price-matching schemes to compete with Aldi.
Aldi regularly wins Which?'s cheapest supermarket title, making it the supermarket to beat on price.
These schemes may not be as straightforward as they seem, with hidden secrets such as multiple matches on pasta and varying amounts of pork in pork pies.
Get expert tips on managing your finances with our free weekly Money newsletter.
Author's summary: Uncovering the truth behind Aldi price match schemes.