I remember my first trip to the U.K., decades ago. The Value-Added Tax was at that time -- and I assume still is -- included in the sticker price of anything you bought. So the price on the goods was the price you paid, with nothing added at the cash register. I imagine that made budgeting a bit easier if you were trying to decide "do I have enough money for these three items?"
The flip side, of course, is that you never knew how much money from your purchase was going to the state. Sure, you could calculate it if you knew all the rates, but no one ever did. This was seen as a good thing for the state.
In Canada we have a weird mix -- most goods are priced in the American style (or what I presume to be the American style), where the price on the sticker is the pre-tax price, and the tax is calculated and added in -- and printed separately on the receipt -- at the time of purchase. One exception is alcoholic beverages, whose price stickers show the "all-in" price, with the sales tax and liquor tax included. (The deposit for returnable bottles is also included in the sticker, but broken out as a separate line on the receipt.)
Some years ago, when there was a big hike in the gasoline tax, and Canadians were starting to grumble at the oil companies, those companies responded by putting printed stickers on the gasoline pumps, breaking out how much of the pump price was actually tax going to different levels of government. That was eye-opening. I don't recall how long that program lasted, before they removed the printed stickers and went back to business as usual.
I'm not sure any of the "transparency" policies had a lasting impact.