The Senate Inquiry into Supermarket Prices has escalated into a debate about the merits of return on equity (ROE) as a measure of profitability. We certainly prefer ROE and other returns measures over percentage profit margins. However, in the case of Woolworths, the ROE of 27% (pre sig items) is influenced by historical cost accounting, buybacks and demergers. Care needs to be taken in looking at a single year.

The Australian supermarket sector is under scrutiny given higher grocery prices. This report is written to give perspective about prices, profit margins and potential risk areas as the Senate inquiry is held over the next four months. Price increases in supermarkets largely reflect higher costs. However, retail prices have risen faster than the producer prices in fresh produce and red meat. Like almost all Australian businesses, supermarkets have faced higher costs and their profit margins are only slightly higher than pre COVID-19 levels.