It's more. Each a4 sheet has considerably more than 1 label on it. Most weeks there's 90-100 pages of weekly limited offer specials alone. Then every day there's large amounts of regular stock coming onto and off of special offer. Then produce is constantly being adjusted based on seasonality, the current weather (better prices on salad when it's hot etc), and to help sell through (warehouse has accepted some stock with reduced shelf life etc).

Then there's the fact the country I'm from has been experiencing food price inflation at almost 20% this year.