BlinkyBill:
I have Woolworths shares. Woolworths owns Countdown NZ and hence staffing numbers are public information. There are 184 Countdown stores and distribution centres in NZ, and a hair over 18,000 total employee’s in the NZ business (i.e. not just store staff, that’s all staff).
So the average Countdown store/logistics branch is serviced by 98 employees including management and head office. That’s full-time and part-time. This from 2018 annual report.
Countdown has more larger stores on average than Pak-and-save, New World and Four Square, etc; so more employees.
I think it’s fair to say most supermarkets in NZ employ well under 90 total employees, full and part time.
They turned over $7.2 billion. Assume that 10,000 full time equivalent employees, all of whom got an extra $1.10 / hour
~ 0.32% "inflationary effect" from supermarket employee wage increases.
(I still don't believe that the 1.5% CPI figure represents even close to reality, but that's just anecdotal - and some things have actually gone down in price, the OP mentioned mince, Countdown reduced the "standard low price" for Silver Ferns Farms venison mince 400g vacuum packs from $12 to $10 over the past 6 months.)