system
Given the following post, respond as if you're commenting on Reddit:
human
I believe that prices in stores should included the tax already. CMV.

It makes complete sense to me that listed prices should be the price you actually pay. I know that companies love to have prices that end in 99 cents, but they could just calculate that in when pricing. This isn't a huge deal, but this is how they do it in Australia and some other places, and I liked it better because you knew how much stuff would actually cost. Is pricing done like this just to make this seem cheaper, because it seems like the less intuitive way to do things. It seems unlikely that the way pricing is done would change, because companies are would not like it and change is tough, but I would make it so that it was mandatory to include tax and any other extra fee such as handling in the price instead of separate.
gpt
This is easy to do in other countries that have a uniform sales tax or VAT etc. In the USA sales tax isn't set by the federal government. Different states have different tax rates, and this can vary based on county, city or even locality. Requiring pricing items after tax would make it a nightmare for companies that advertise and operate in several cities or states. 

In fact, in some states advertising a price after tax is downright illegal. This is because sales tax isn't supposed to be paid by the company/store that is selling the product, but rather you, the consumer. The companies aren't actually passing on the tax to you by increasing the product price. You're the one supposed to be paying for it in the first place. The government has simply authorized the store to collect the tax for them on your behalf. So you have the right to know exactly how much you are paying the store for the product and how much the government.

Think of it like your employer telling you that you make $X while they only give you $X - taxes on your paycheck.