Completely serious question here: is it still price gouging if they're one of a few players in town?
Information asymmetry is only valuable if you can execute on it. All of your examples are actually examples of both asymmetry and market control. HVAC, there's typically only a few legitimate licensed providers in town so they can set the price however they want. Car servicing, indie shops are always better but if you want to maintain your warranty you'll need to use a stealership which goes by a book (and it's mandatory).
I'm not convinced an LLM can help with these situations. I would suspect you're more likely to get a "screw you" price in return rather than winning a negotiation. When I shopped for a new HVAC after mine gave up the ghost after 20 years most providers were within a few hundred dollars of each other. An LLM would've been useful here for warnings ("you probably dont need ducting", "you probably don't need duct cleaning") but as for the bulk of the cost there's a monopoly and there ain't nothin you can do about it. When I got my yard worked on it was a similar story. Despite every landscaper providing offers from cheap to absurd, the ones that I could sue if they hit a gas line were all within the same price range.
These people are also very used to the "know-it-all homeowner". They're more likely to ignore you than help you because if you actually knew-it-all you'd do it yourself.
I think, rather, LLMs will be extremely useful in bill negotiation where the data is absolutely clear, you have a copy of it, and it can be analyzed in full (no asymmetry). For example, an LLM could be trained on medical billing codes and be able to analyze your bills for improperly coded procedures (very common).
The LLMs help you understand how the pricing works.
Eg: when my shower didn't work I was able to figure out all steps - and also do most of them before getting stuck at one particular point because I couldn't physically pull the unit out of the socket.
I was able to negotiate down $150 for that one.
In another instance with gas pipes I was able to find laborers who were good but just didn't have a branded van yet.
In this case LLMs help me understand that the laborer was damn good at his job and how to cut the cost of the job by breaking into different pieces.
The whole process is very tactical - you will lose quite a few negotiations before figuring it out. Also its not useful to just abstract all the jobs as you've done in your post. You've somehow got to the EMH except for service providers - its just not true.
The way different types of compnaies force you to pay more is very different. Lockpickers are very different from plumbers for example.
Also each service provider have their own way of doing things and breaking points.
Also every geography is different. Service providers seem to charge the most with elderly house owners and peopel with nice houses in nice areas. So you can definitely use LLMs in those situations to find areas to put ads to attract better prices.
the best part of all this is how you can apply these negotiation skills to your job search or any other situation. definitely a long game like finance or health.
Information asymmetry is only valuable if you can execute on it. All of your examples are actually examples of both asymmetry and market control. HVAC, there's typically only a few legitimate licensed providers in town so they can set the price however they want. Car servicing, indie shops are always better but if you want to maintain your warranty you'll need to use a stealership which goes by a book (and it's mandatory).
I'm not convinced an LLM can help with these situations. I would suspect you're more likely to get a "screw you" price in return rather than winning a negotiation. When I shopped for a new HVAC after mine gave up the ghost after 20 years most providers were within a few hundred dollars of each other. An LLM would've been useful here for warnings ("you probably dont need ducting", "you probably don't need duct cleaning") but as for the bulk of the cost there's a monopoly and there ain't nothin you can do about it. When I got my yard worked on it was a similar story. Despite every landscaper providing offers from cheap to absurd, the ones that I could sue if they hit a gas line were all within the same price range.
These people are also very used to the "know-it-all homeowner". They're more likely to ignore you than help you because if you actually knew-it-all you'd do it yourself.
I think, rather, LLMs will be extremely useful in bill negotiation where the data is absolutely clear, you have a copy of it, and it can be analyzed in full (no asymmetry). For example, an LLM could be trained on medical billing codes and be able to analyze your bills for improperly coded procedures (very common).