> How would the government even be able to determine if a business increased product prices due to tariffs vs other factors, or even if the business increased prices at all? What if the product is a loss leader and the company was fine just eating the expense? Or what about a nefarious company who manufacturers their stuff in Canada but used "tariffs" as an excuse to increase prices? What would they be refunded from?

Gee, I don't know, receipts ?

Also simply revenue on the business end