I bet she wouldn't swap roles with the people working in the depot if the wages become "equal" though would she.
people stacking shelves in a supermarket often are slow as hell, take their time have a chat with a colleague at the same time.
Having personally working in a boots warehouse once upon a time in Nottingham where my roles included.
Unloading/loading trucks.
Moving pallets and the tall metal cages from the loading bay down to the storage area.
You are constantly on your feet, it's fairly physically demanding (we used pallet trucks like a carjack on wheels, not the luxury of a forklift truck)
Often the truck drivers would also get out of their truck, grab a spare pallet truck if there was one laying around somewhere and also help because they were in such a rush to get out and on to another job which just added to the stress of needing to be as fast as possible.
depot staff likely have had to do safety straining the store staff havent for obvious reasons.
working environment is completely different, one is cold, horrible in the winter, one is nice all year round.
There was no time to chat, no time to relax, no time for a small break at your leisure.
how can these 2 jobs even compare? it's laughable.