This might seem a bit obscure but I suspect some techie types (
@kentaddick ?) may know stuff about this which might benefit the rest of us.
So I think we all understand what dynamic pricing is. Basically the more demand there is for an individual flight, or train, the quicker the prices rise - or they might also drop when demand is below what they projected.
But is there also something else going on, which we can fight back on? Do they sometimes offer a really low price for a new enquiry, which then quickly rises if that enquirer doesn't complete the transaction there and then, but comes back later to try again? I have a strong suspicion that some of them do. If they do, is there any way round it, such as using a VPN to make the second enquiry look like a new one? Do you also have to expel cookies to make sure the travel site still doesn't know it's you?
Hopefully a few Lifers may have an inside track on this...
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In my case it appeared to be related to service provider, as when I tried again while visiting a friend (in a different town) who has a different service provider, I got the initial price back (using my laptop both times)
For my trip to NZ/OZ a few years ago, went into a sta travel, they quoted me a price, went on skyscanner afterwards and found cheaper flights on skyscanner for the same dates. Altogether i saved £1500 per person doing it on skyscanner rather than using an agent. I did have to eat what can only be described as dog food on my uncomfortable china eastern flights... but i saved boatloads!
If it's using your login then obviously changing devices, clearing cookies, etc. isn't going to do anything you're telling it who you are straight off the bat.
Traditionally a website would track you through cookies, so clearing you cache/cookies will defeat that.
These days things are a bit more complex and a VPN may be the only real way to defeat a determined site.
The most determined sites/systems will build a fingerprint of a user. This will include a huge number of variables that it will try to use to uniquely identify you. On a basic level that may include browser version, operating system name/version, external IP address, your network adapter MAC address, what other cookies are present, etc. Even in incognito mode there's still a basic level of information the browser will reveal to a website that could be used to build a unique view of the user.
Once a site can uniquely identify you then it can start tracking you, send targeted ads, etc. There's an ongoing EU court case against Facebook (and others) about this very subject. Even if you're not a Facebook user they'll stick a cookie on your machine, that along with the sort of info I've mentioned above, is then used to create a profile and track you across other sites (a huge number of sites have Facebook code embedded for social media features) and then target adverts at you when you visit Facebook or any site that uses Facebook for targeted content.
But here is one technical reason why it happens.
Most booking sites work by offering cheap prices for the first few seats with the price rising as seats are booked.
So there are two seats at £50.
fours seats at £100.
tens seats at £110.
etc.
When you try to book two seats, you are offered the bargain deal - £50 per seat. But the site cannot now offer those seats to anybody else until it is sure you are not going to complete your booking. Otherwise it might end up selling more than two seats at £50.
If you come back with another request it can't actually be sure that it's you or that you won't somehow manage to book four seats at the bargain price by cleverly going back to your original search and completing your booking.
So the bargain has to be locked for an hour or so.
Perhaps it's better not to assume conspiracy when ignorance and general incompetence is far more likely.
Never "accept all cookies" or whatever way that is presented. It takes time and is a faff but there's value in only agreeing to the absolute minimum cookies/tracking/etc/etc options on webpages - raising prices because you've previously visited that site might be illegal but it's practically impossible to track, let alone prove.
I'll see if I can dig it out...
EDIT... apologies, realise this isn't what you were asking...However, I think the same principle applies.
That said, pretty pleased with my memory recall!