As a privately owned company, Aldi rarely gets the sort of scrutiny faced by its listed competitors Coles and Woolworths, which are required to provide regular public disclosures including profit updates. But this week the public got a rare glimpse into the supermarket chain’s profits and strategy as its executives underwent questioning by the Australian Competition and Consumer Commission. Senior business reporter Jonathan Barrett tells Nour Haydar how the German company makes $12bn in annual revenue and why it rejects online shopping. You can support the Guardian at theguardian.com/fullstorysupport