Amazon Automatic Pricing Lists Book At $23M 147
leek writes "An Amazon.com pricing algorithm which lets sellers set prices based on other sellers' prices led to a positive feedback loop, causing the biology text The Making of A Fly to reach $23M. Biologist Micheal Eisen writes: 'What's fascinating about all this is both the seemingly endless possibilities for both chaos and mischief. It seems impossible that we stumbled onto the only example of this kind of upward pricing spiral. And as soon as it was clear what was going on here, I and the people I talked to about this couldn't help but start thinking about ways to exploit our ability to predict how others would price their books down to the 5th significant digit -- especially when they were clearly not paying careful attention to what their algorithms were doing.' The price of the book was reset but is currently back up to $976.98."
Can we get this going the other way? (Score:1)
Call me when I can buy a Nintendo 3DS for fifty cents.
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That was yesterday, but since you didn't post your phone number you missed out. Better luck next time!
Re:Can we get this going the other way? (Score:4, Funny)
Ooh! count me in!
My number is (212) 867-5309
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Dude, your voicemail is full. You should check your messages more often.
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Price-Fixing with no collusion? (Score:5, Interesting)
Now that robots are setting prices, must they follow the same rules as people? I would think that, without any explicit agreement, using game theory type decision making alone, a pattern of "price fixing" could certainly emerge by virtue of different algorithms making their own optimizations.
Is this okay?
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Of course it's okay, just don't expect me to buy anything if I don't think it's worth it!
Well, this story goes a small way towards explaining some of the ridiculous prices from some Amazon 3rd party sellers. I saw a textbook recently for hundreds of pounds and wondered wtf they were smoking when they set that price.
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The sellers want to sell just as much (or more!) than you want to buy. This will sort itself out soon enough.
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"Now that robots are setting prices, must they follow the same rules as people?"
No, they can even open stores on holidays, when no salesperson is there, as we learned recently.
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I would think that the sellers bear any responsibility for what their automated programs do.
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It's not fixing if each actor, basing his actions on his own motivations, performs actions that happen to be beneficial to other actors. I should think that the same rules should certainly still apply.
Ignoring the fact that the algorithm here is broken, why would it matter if it's an algorithm or a person who decides how their product should be priced? In both cases, inputs of other prices of similar goods are used to set the price for yours.
Re:Price-Fixing with no collusion? (Score:5, Funny)
Now that robots are setting prices, must they follow the same rules as people?
No. Here are the rules for robot pricers:
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I think you got the 2nd and 3rd laws the wrong way around.
Classically of course, you are right, but not from a commercial perspective.
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I accidentally left an extra "not" in the rule while I was editing it. The logical conflict probably means that the robot is going go insane, take over the world's computer systems, and launch a global nuclear war. My bad.
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You goofed. there are four laws:
1. A robot must maximize profits, and may not through inaction allow profits to be less than maximized.
2. A robot must obey any orders given to it by human beings, except where such orders would conflict with the First Law.
3. A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.
4. A robot may not injure a human being or, through inaction, allow a human being to come to harm, as long as
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Get off slashdot and finish writing your thesis!
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This is too much like the artificial and broken economies in MMOs and their auction houses. No real bidding only buyout prices and everyone has their prices as high as they can. After all, $23 million may be too expensive for a newbie player, but all it takes is one twink to buy that book and the seller will feel it's all worth it. In an MMO this works because it costs you nothing to make the product and it costs nothing to keep relisting it over and over. In a real world store though you should feel in
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So long as your price fixing loop doesn't cost an investment bank money. They're *entitled* to a profit, and if you harm that you need to be jailed and all the transactions you performed undone. I wish I had the link to that story still lying around.
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No, it's ok if an investment bank loses money. The government will just bail them out so their investors don't lose anything and nobody has to cancel their house renovations or trips to tropical places.
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let's get to the source of the problem (Score:2)
you're welcome.
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So long as your price fixing loop doesn't cost an investment bank money. They're *entitled* to a profit, and if you harm that you need to be jailed and all the transactions you performed undone. I wish I had the link to that story still lying around.
So was Enron.
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I am not quite sure I got all that, but here is how I see it...
That was the old way of doing things. Now that our calculators and typewriters have been replaced by computers, everything is different and we need to rethink every principal that ever hindered business.
(Of course, it helps that the gilded age was so long ago that we now see it as a utopia that has never been tried.)
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Corporations aren't really owned by people. Stocks are effectively just a loan to a corporation in exchange for the expectation that the company might eventually buy back those shares or pay dividends. If you truly owned a portion of the corporation as you would in a partnership, you would still own a portion of it after a corporation files for bankruptcy instead of losing everything when they shift their assets into a holding company and dissolve the old company at a loss.
Further, even to the extent that
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This was a "positive feedback loop", meaning one or both parties were jacking up the price a little on their end, this was necessary for growth. So somewhere else the book is being listed at a similar price. And either there, at amazon, or both, they're set to "look at the other guy's price and add 2%" or something like that. Even if amazon's is set to undercut by say, 1%, if their reference site i
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As was postulated in TFA, it may be that one of the parties didn't have to book and was planning to buy it from the other. So A said I'll buy the book from B if an order comes in and sell it for 25% more, and B was looking at prices for the book at other stores and saying I'll sell for 5% below the lowest price. So every N hours A looks at B's price and sets its price 25% above that. Then B looks at A's price, sees it has gone up, and adjusts its price up accordingly. And so on.
If there were 300 copies o
Nice try, Slashdot (Score:4, Funny)
Way to embed your affiliate code in there. You're not making anything off my purchase of a $23M book.
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Or clear your cookies every time you close your browser. :)
Textbooks are too expensive (Score:5, Funny)
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Seemed kind of low to me, too.
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On the bright side you might be able to sell it back for $10
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What really happened, I think, is that they mixed up the textbook cost with the tuition.
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US$23M hmmm given an average US textbook price of say $100 now, how much hyper-inflation would result in this price in say 10 years?
I don't know; the finance textbook is $2 million.
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$23,000,000 = $100*e^(x*10)
230,000 = e^(10x)
ln(230,000) = 10x
ln(230,000) / 10 = x
1.2346 = x
x = 123.5% continuous inflation.
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Did they design this system or just implement it? (Score:1)
Goin out on a limb here, but I think 23 million is a bit pricey.
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I've seen books on Amazon before that were in the thousands of dollars - books that you can find at any used bookstore for 50 cents, we're not talking ultra-rare stuff here. So this isn't a new bug and they're bound to have had complaints many times before. I think this is the first time they've let the loop get this far though.
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But thw latest "Harry Potter and my Overflowing Bank Account" is worth it, isn't it?
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Apparently to enough people that Amazon hasn't seen it as a bug. If people are willing to pay thousands for a pop paperback, it would be economic stupidity to fix the error. If the extreme prices had actually cost Amazon money (directly or indirectly), the bug would have been fixed long ago.An alternative explanation is that the bug has been random enough that fixing it would have merely added a few dollars chump-change to the sales - nowhere near enough to pay for the bugfix.
Hmmm. I'm definitely getting th
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I've seen books on Amazon before that were in the thousands of dollars - books that you can find at any used bookstore for 50 cents, we're not talking ultra-rare stuff here. So this isn't a new bug and they're bound to have had complaints many times before. I think this is the first time they've let the loop get this far though.
I've seen the same thing, but it was always in a context of a dozen different stores all selling the same used book. All but one would have a reasonable price. One, two, maybe five dollars. But one store would be above $1000. I could never figure it out, and the one time I sent email to the store asking why they were so high I didn't get an answer.
I assumed it had something to do with a money laundering operation.
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If they continue to launder money at that rate, there'll be a world shortage of washing powder.
Why pay $x when you can pay $x^x? (Score:2)
I've seen sites that answered their own question of, "Why pay $9.95? Our price: $8,478,902,736.92".
Of course, whenever it is in the customer's favor, it's always a pricing error.
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According to them, 0 units at $8.5b. Clearly people must be pirating the content, and should be sued to recoup the money!
ah dammit (Score:2)
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...thousand
It happens (Score:3)
I added Around the World in 80 Days to my cart one day and forgot about it. Later in the week I went back and saw a notice that the price of an item in my cart had changed. When I looked I found that the movie had gone from a modest ~20USD to over 800USD. I let it sit there and a few days later it changed again, this time to ~18USD. I bought it immediately before it could get worse again.
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Soon you'll need HFT algorithms to get a decent price on a book. There could already be a few banks out there fast-trading book futures.
es de dominio publico (Score:2)
sucker.
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The time is right (Score:1)
I'm going to set up an options market for Amazon so that people can trade futures based on the expected price of a given book.
What the summary forgot to mention (Score:4, Informative)
The summary apparently forgets to mention that the sellers in this case are not Amazon themselves, but third-party vendors using Amazon's used book sales thing.
Note: The article does make this distinction, so it's just a bad summary.
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Actually Amazon uses an automated script to change their prices to reflect changes in other sellers. They reset their own price and as you can see it is back up to over 900 dollars.
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I'm uncertain why one would have an algorithm that automatically made your price slightly higher than the competition.
Unreal (Score:2)
It seems like you could even exploit this.
Re:Unreal (Score:4, Funny)
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*Note: All the above (:-) for the humor impaired
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Where do the underpants come in?
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Not so bad (Score:2)
Sell This Book Back for $2.34 Whether you buy it used on Amazon for $158.90 or somewhere else, you can sell it back to our Textbook Buyback Store at the current price of $2.34. Restrictions Apply
Oh... wait...
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I wish the book store at my college paid those rates! They wouldn't even buy back the one book I tried selling to them.
This is obvious. (Score:5, Insightful)
Buy Back (Score:2)
Anyone notice that the buyback price seems to imply that the book is utterly worthless? I've had better returns on college textbooks (at the campus bookstore) and at used book sellers around town.
Feedback loop? (Score:2)
If you read the fine article, it seems that this price is based on an automatic price-fixing scheme. If they raise their prices, I can raise mine too etc. etc. until their books are astronomical in cost. In a good market, this would be the other way around where prices automatically go down until it gets to break-even prices as competitors race to get customers. But in a monopoly or duopoly market (as books, music, movies, cable, internet and other media often is) the prices go higher and higher in order to
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Except it isn't just that hald, if's also "if my competitior lowers their prices, I need to lower mine".
When one half of the loop is setting there price to be *higher* than the competitor you have the potential for some strange feedback loops - it's a wierd pricing scheme (though it can make sense under a few models).
One vendor has the usual approach approach that economics expects: undercut my competitors price by a small amount.
But the other vendor has the strange: charge more than my competitor.
And since
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which would also be a funny result...look at all these books that only cost 1 penny! The charge more competitor isn't really that strange...they're probably not maintaining any stock and need to go buy the book when ever they make a sale...so they have to charge more to provide room for buying the book elsewhere + some profit. Isn't going to get very many savvy shoppers who, say, price compare, but it could rope in some buyers who are in a hurry or aren't paying attention (of course, that's all assuming t
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It could also be on the assumption that the competitor only has limited stock of each "used" book, combined with the preference to maximize profit per book rather than turnover. Mark my price a little higher than my competitor and once he has sold out, I will then become the cheapest and also know that my price is still "market rates" and thus I will make slightly more profit than my competitor.
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Cycling down you would expect to have a limit - "don't go under what I paid for the book + X%", but making an upper limit isn't so important.
Yes I said their were a few models under which charging a bit over the competitors makes sense, but I wasn't going to bother describing any given the article already describes a few.
price history graph (Score:3)
Not even remotely the only, or even the first (Score:2)
From the summary:
While this is an extreme example, this kind of crap has been going on since (aided and abetted by Amazon and Alibris) the amateur commodity booksellers burst onto the web in the late 90's.
Scrapers and ratings manipulators like 'bordeebook' are one of the multiple ways that the 'net has made the professional used and rare bookman nearly extinct.
Bad headline/summary (Score:2)
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But in order for this to happen, each one has to have "price X% higher than seller Y's price, with no maximum" as its algorithm.
I'm not sure how that's supposed to be a profitable system.
Anyone looking on Amazon is going to buy from X because their price is lower. Raising your price above someone else's means you lose the sale.
So why are these people doing that to themselves?
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But in order for this to happen, each one has to have "price X% higher than seller Y's price, with no maximum" as its algorithm.
Not quite. There was actually a detailed analysis of this spiral. What happened there is that one bot indeed had it set to ~15% higher, but the other was actually set to offer it ~5% lower. The problem is that those two bots were the only sellers offering the book, and therefore they only saw each other - and as the +15% one raised its price, the -5% one also went up.
Now why one bot offered it for +15%? It has a much higher seller rating with lots of positive reviews, so it's likely that it would pop up fir
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You don't need both parties to be "price X% higher". Consider the rules:
Joe: Price 5% higher than Bob.
Bob: Price 2% lower than Joe.
Any time you've got people pricing relative to each other with no limits or outside references, you can get a runaway price change.
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> Anyone looking on Amazon is going to buy from X because their price is lower.
Not necessarily, you are assuming that all offers are equivalent and are differentiated only by price.
I have often passed-over the cheapest offer on Amazon because of;
1. Condition of the item being sold;
2. "Postage" policy ( our wee country is not part of the mainland );
3. Seller feedback ratings;
4. Poor grammar in an item description ( correlates with seller's attitude );
5. Prosaic reasons, such as the higher-priced item bein
Supply side only? (Score:1)
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If it's the sale price instead of the listing price, it would never get this far.
Or did someone pay $22 million elsewhere?
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Personally, I wouldn't pay. (Score:2)
And in Canadian Dollars (Score:2)
...the book will be priced more by 20 percent.
Even though the US and Canadian dollars achieved parity in December of last year and the US dollar is on the low end.
http://www.x-rates.com/d/CAD/USD/hist2011.html [x-rates.com]
Oh the days when I could go shopping in Canada when the Canadian dollar was 1/3 less (really, 33 percent - 400 bucks got me 600 CDN) than the US dollar.
--
BMO
Great book! (Score:2)
How many slashdotters clicked the link not just to see a high selling price, but because the book actually sounds damned interesting?
How About Negative Feedback Loop? (Score:1)
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Well price goes down to a penny and they both cover their costs via the £2.75 postage and packaging. It does happen reasonably often with certain books.
Fly Sex (Score:2)
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Did you ever stop for a moment and think that maybe people are willing to pay a huge amount of money for some info and pictures of hot, hot fly on fly action?
Hello, McFly!!
robot pricing/selling meets robot buying (Score:1)
Wonder how the buying robots (i.e. inventory replenishment, etc.) will react to the run-away pricing robots...in this fully automated loop!
Automated price adjustments aren't new (sort of) (Score:2)
In EverQuest, an MMORPG that predates WoW, people have been using third-party software to automate many things for years, including selling items in the Bazaar (marketplace.)
Due to common errors in logic, it was fairly easy to spot, and somewhat easy to exploit, these scripts. The scripts would re-price their items based on other items for sale, either to lower the prices to just below the lowest price, or raise them when competing items were sold and theirs were the only items of that kind for sale.
I know
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I'm going to buy all the used hardcovers for $40 and paperbacks for $200 and sell them all for $90k each! MUAHAHAHA >:-)
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[*] Funny story, apparently some people think what they see on teevee is real.