Economists praise "price discrimination" as "efficient." That's when a company charges customers different sums based on inferences about their willingness to pay. But when a firm sells you something for $2 that someone else can buy for $1, they're valuing the dollars in your pocket at half the rate of the other guy's.

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If you'd like an essay-formatted version of this to read or share, here's a link to it on pluralistic.net, my surveillance-free, ad-free blog:

pluralistic.net/2025/06/24/pri…

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in reply to Siobhan

@siobhan @bodhipaksa @EndicottAuthor

The big UK supermarkets have used personal pricing for years. But they don't call it that: they call it "offers chosen for you." Anyone who doesn't opt into the loyalty scheme pays full price for everything.

About the only defence a customer has is to carry a physical loyalty card rather than installing the store's creepy app. Unsurprisingly, when you apply for the card, stores push you really hard to install the app instead, and, for at least one store (Marks and Spencer), it's the app or nothing. The app, of course, needs an outrageous set of permissions and contains no fewer than ten trackers:

reports.exodus-privacy.eu.org/…

in reply to C++ Wage Slave

@CppGuy @siobhan @EndicottAuthor That's different, though. If you have a loyalty card you know the price of an item, and you know what the discount will be. Anyone with a loyalty card will get that discount.

What some supermarkets in the US seem to be talking about is tracking people with facial ID and combining that with data from data brokers in order to gauge how much to charge you. Buying tampons and you're on your period? Price goes up, b/c they know you really need them now.

in reply to Bodhipaksa

@bodhipaksa

I understand the distinction, but the UK is already closer than that to personalised pricing. Some discounts are available to everyone with a loyalty card, but others, offered online, are personalised. Tesco seems to use them to tempt me to buy

  • More than I need of products that I've already stocked up on, and
  • Products that are a bit more expensive than I usually buy, and which I don't want to get into the habit of buying because I know the offer is temporary.

Sainsbury has a big sign, touting personalised offers, at the entrance to our nearest branch. And the checkout usually prints vouchers of the form "spend twice as much as usual within a week and get £15 off the bill".

@siobhan @pluralistic @EndicottAuthor

in reply to C++ Wage Slave

@CppGuy @siobhan @bodhipaksa @EndicottAuthor

In the case of Tesco, the biggest loyalty card pushers, it's not discounted price and real price. It's real price and profiteering price. This was obvious when they rolled out this in a big way, a few years ago, where in my local Tesco Express I saw price increases of 50% and above in the "non-loyalty" prices, almost overnight. It worked, I got a card. (That shop is trivial walking distance, anything better is a bus ride.)

Except Jaffa cakes. Pricing there is nuts. Always check all sizes for which is cheaper today. But don't buy any size unless at least one has an offer. And if you can afford it, if something you want but not need does not have an offer, wait until it does.

in reply to Cory Doctorow

remember this one?

“We've never tested and we never will test prices based on customer demographics,” said Amazon.com founder and CEO Jeff Bezos.

(After testing randomly varying prices on customers)

press.aboutamazon.com/2000/9/a…

Cory Doctorow reshared this.

in reply to Marco

I've seen the same effect on a singular Amazon prime account when viewing from the app on android and brave on Linux (reports as chrome windows)

The app price was more expensive for the exact same item and didn't show all of the colour options which varied in price

I compared this with a family member with a prime account on Firefox Mac and they had higher prices still

The prices are totally manipulated based on device profiling

This entry was edited (3 weeks ago)
Unknown parent

mastodon - Link to source

maya_b 🇨🇦

@jackwilliambell @simon_brooke
with the "first rule of business" typically being a variation of "never leave money on the table" means any seller will try to maximize profits, regardless of who they're selling to, or at what price point.

there are are also pricing strategies to drive consumers to "pick" a desired option. eg 3 similar things for sale: one cheap in all regards, one overpriced, and one "Goldilocks" in between option that has the best profit margin of them all.

in reply to Cory Doctorow

uff, at the start of the article I thought: yes, I'm fine if the swimming pool charges me more than families (kids are expensive AF), more than students who don't have an income, etc. I'm fine to buy the social espresso in Italy and have a free espresso go to the next in need. I like fighting food waste by have the store lower the price of things that go bad soon (large choice for me. Low loss for the store for overstocking). (Not overly happy about small choice for the needy)
in reply to Cory Doctorow

Clearly Amazon knows who would pay more than others and clearly it is in their interest to charge accordingly. They control the market and when you can control the market, you can extract more profits from it than an efficient market would allow any trader to extract.

For the producer and the buyer, an efficient market would be the best as then, the middle man would extract the least.

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mastodon - Link to source

Jack William Bell

@dnkboston @simon_brooke
> "… a lot of people don't have options, and the people who run them know that."

I suspect it's more complicated than that. If you only have a dollar you don't have an option – unless you don't actually NEED the good on hand, in which case you have the option of not buying cosmetics or a stickerbook or whatever.

And yet people with little money buy those things. I'm not condemning them, but I am saying there are no simple answers for complex problems.

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mastodon - Link to source

Deb Nam-Krane

@jackwilliambell The not-poor can afford a better value because they're not poor.

When Jack Monroe created the index, they were writing as they were going in and out of poverty. Other poor people knew they were being hustled but literally couldn't afford to do anything about it.

Dollar stores don't exist because people are thinking they can get a better value. They exist because a lot of people don't have options, and the people who run them know that.

@simon_brooke @pluralistic

in reply to tasket

@tasket @Gargron s

See pluralistic.net/2023/04/16/how… in which I explain my choice of servers, etc, as well as how to filter threads in your timeline.

My threads are CC BY, and available in fulltext RSS. You can remix that feed however you'd like including publishing it on Fediverse in a format you prefer.

I publish in multiple formats and you are more than welcome to unfollow here and get them some other way.

As my bio notes, 'I post long threads.'

in reply to Cory Doctorow

@Gargron Thanks, but I decided to switch to using RSS for your feed. The issue is that I still want to see "Long threads" emerge in my TL, but only the first 1 or 2 parts.

Mastodon has remained assiduously non-algorithmic in its TL presentation. So in rejecting complex, blackbox algorithms it also rejects ones that could be less than 4 lines of open code yet very beneficial to the users' pursuit of "effective communication" to use Eugen's term.

in reply to tasket

@tasket @Gargron This is what I do and it actually works wonders for me. I think the chopping up and posting is automated though? But you’ve touched on another reason why I just don’t read threads on here very often. If there’s a thread with like five or six post? I simply won’t read it. Give me a blog post with a three hour estimated reading time and day of the week though and I will sit down and read that whole post in one go!
in reply to Cory Doctorow

Ah! Gotcha! I thought it was automated, so thanks for clearing that up! I wish more instances had giant character limits like mine. It makes posting things like this far easier and with 1 simple CW I don't clog up people's timelines !but to the other person, he usually posts his link in his first post at the top of the thread, so if you see a chunk, go to the first post. For example, this one is pluralistic.net/2025/06/24/pri… @pluralistic @tasket @Gargron