In the kind of less formal bodegas that do a poor job listing prices, this clerk might very well be the owner or a family member.

Chain convenience stores and grocery stores will reliably list their prices for each item

It could have an effect on the owner in the current US job market though — clerks may no longer be willing to do crazy checkout item shuffling for minimum wage and decide to quit. Then the store owner has to choose what's in their best interest: add price tags to items so minimum-wage workers won't quit, increase wages to convince the workers to stay, or shutdown the business.

It will if people do this en-masse and the throughput of the store goes to zero.

As shitty as it is, making the job harder drives the wages up because people would rather quit than do it.

Do a full Karen and ask for the manager... every time.