system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do I have to negotiate a price when Im buying a new car as opposed to all new cars just having a bar-code and everyone paying the same price? Why cant I negotiate the price of a shirt Im buying at walmart?
gpt
You can negotiate a shirt at Walmart. Nothing is stopping you, there is no difference. Price tags and ads for cars are the same as they are for a shirt, they are merely an invitation for an offer. Except with a car you usually offer lower until you agreed in a contract, and with a shirt you usually just match their invited offer and make a contract by just paying what the tag said. 


Except in reality, we know cashiers don't have that authority and everyone else behind will be pissed off. 


Society in general developed a cultural code that we don't bargain for small and plentiful items. It's not worth the time or hassle. What you can and can't bargain for isn't written in stone or law though. You could go to Walmart and probably work out some sort of deal on a TV if you tried.