It is usually people who are paid in cash.
The wealthier you are, the less likely temporary inflation will erode your wealth because you will have better ways of allocating your money with inflation hedges. You would own a home or you would own investments that would respond to inflation.
People who are paid with cash don't necessarily get the raise they would get from their cost of living. Their groceries may have gone up 10%, but the official inflation rate from StatCan says something like 5%. If they get the 5% inflation raise, they might see their quality of life deteriorate. They're also the most likely to have cash in the bank accounts, which is not allocated to their investments.