Google now knows you have a broken laptop and can estimate how desperate you are to fix it.
Because it knows how desperate you are, it can increase shop prices proportionally.
You are going to pay the maximum they get you to pay.
That's algorithmic pricing.
The more companies know about you, the more they can predict and sell how desperate you are to other stores out there.
An internet-connected car knows much more about you than you realize. A smart TV also knows what you like. Your Alexa knows if there is a problem in the home.
I agree with the broad premise that your information has value, but I wouldn't worry about Google increasing prices just for you. Companies still control their own websites and they aren't going to allow another company to change what they change directly.
What Google sells is the ability for a company to get their website in front of your eyes. They sell the top spaces in your search results. A company who doesn't pay Google gets pushed to page two.vor three. Now in a sense that increases your prices because the cost of the companies increased ad budgets is passed on to you.
You don't think companies would opt into letting Google manage "dynamic pricing" for them on a per-user basis? Travel sites already offer this for airlines after you signal intent, such as a destination and date range... And sellers on Amazon already use tools like Sellery to algorithmically reprice items without human supervision. Some products change price hundreds of times per day as a result.
Big retailers like Walmart are trying to make "personalized pricing" work, which tries to anticipate price tolerance based on past shopping behavior on an individual basis.
So it's not a stretch at all IMO to imagine Google offering a "personalized pricing" service that you can install on any website, right under the script tag for Google Analytics. Or Amazon, or Walmart, or whoever-- They all have mountains of data on us.
You make a good point, but think of it this way. Someone Googles "tips on buying a new laptop". Companies enrolled with the Google program bump up their prices for that user. But what about websites not enrolled in the program? Their prices stay lower, so if the person buying the laptop ships around even a little bit, they will likely buy from one of the non-affiliated sites.
It only works if the whole marketplace is under the system. Amazon is a shopping experience tailored to keep people inside their system, so it works with them. You aren't going to take the time to price match across multiple websites for a pair of socks. I think it is a lot harder to manipulate prices with big-ticket items, where people will put in the effort to shop around.
Their prices stay lower, so if the person buying the laptop ships around even a little bit, they will likely buy from one of the non-affiliated sites.
So... I don't think that's necessarily how it works, at least not in aggregate. The first issue is the market capture you mention: Amazon has a sort of "soft" market capture-- you're free to buy stuff from wherever, of course, but Amazon encourages customers to stay in their ecosystem, and also doesn't permit sellers to set prices lower off-site for products that they list on Amazon (e.g. if they want to have a sale on their own website, that sale price must be reflected on Amazon, too). Those are some of the ways that Amazon exerts "soft" market control, which we both recognize is enough for algorithmic pricing to work.
Google also has this kind of "soft" market control... And they are generally much wider-reaching than Amazon. For instance: You suggested that people will "shop around." How do people shop around? They probably use a search engine, and their search engine is probably Google. If Google was trying to interpret intent and guide their shopping decisions, why wouldn't they privilege companies using "personalized pricing" in the search results, and bury non-participating competitors? Similar things already happen with ads. So when the user "shops around a little bit," they are probably doing so in the context of the first page of Google results... Which, of course, Google is in control of.
Some people will clue in and search through other channels, or have retailers that they prefer, and visit directly... But many people will not bother/know to, just like they don't bother/know to check CamelCamelCamel for Amazon price history to see what the algorithms are doing. Sometimes it's lazy or complacent, but lots of the time they just don't understand that it's happening, or the degree to which it affects them.