Apart from the comical cost of extracting this data from paper receipts, is it more likely that stores will publish their product costs over time so trends can

Apart from the comical cost of extracting this data from paper receipts, is it more likely that stores will publish their product costs over time so trends can be observed or be more like gas stations where no prices are listed. I have no idea why a box of Cheerios costs $7 for processed oats but i see millions of reasons to obscure that data.