How does Market Priotrity work?
By
Black_Aftermath,
Posted on: 2009-11-26 13:09 in The Market and Inventions
I believe that when there's a tie on lowest price, who the sale goes to is randomly decided.
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In theory, it's random.
In practice, it follows a predictable pattern but the only way you can notice this is if you have a group of people posting the same item at the same price, then systematically buying them all to see what happens (which people on The Market channel did).
So, for all practical purposes, it's random.
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As a peripheral point, this is why a lot of people list for prices like 124,600,908 or 125,810,666 or something... the first will sell before the "125,000,000" people. The second will sell after the 125,000,000 people but nobody's going to guess the exact price, so we'll sell for 130,000,000 or more.
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Yeah, if you can dig up the 8/24/07 issue of the City Scoop, I wrote an article about this. Sadly, that was on the old forums and my link broke. The bottom line is that it's random in the sense that you aren't going to be able to predict it unless you know the order in which every seller listed their item. It's not really random, because if you do know the order in which people listed their items then you can predict the exact order in which they sell. It's not first in first out, and it's not first in last out, or anything that easy. It's more like a random series, but the series was calculated once and then frozen, or it always uses the same seed, or something.
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Originally Posted by Ironblade
In theory, it's random.
In practice, it follows a predictable pattern but the only way you can notice this is if you have a group of people posting the same item at the same price, then systematically buying them all to see what happens (which people on The Market channel did). So, for all practical purposes, it's random. |
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Is there any particular reason for randomness? IMO FIFO is much more fair...
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The only thing that we could come up with was, that adding a time stamp to all bids and offers just for resolving single influence ties, could potentially increase AH server lag for every bid/offer and only provide a resolution for a very very rare occurance. It's probably not worth increased lag, coding time, and increased server usage for those rare occasions and the devs decided to use a (not so) random number generator instead.
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Originally Posted by NordBlast
Is there any particular reason for randomness? IMO FIFO is much more fair...
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Well yes and no. Pure FIFO locks out completely people who post later at the same price point until the entire stock is gone.|
Originally Posted by NordBlast
Is there any particular reason for randomness? IMO FIFO is much more fair...
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With people using the market across timezones this can be a minor issue, and likely the reason it isn't pure FIFO
Slightly off market example: When Auto Assault went through the server merge, the first log-in on the new merged sever reserved the name. These mostly went to Europeans due to the timing.
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It's probably based on the way the database engine orders result sets when multiple records match the selection criteria. It may not be random, but might be based on something in the database, like the database ID of the record. That's usually sequentially incremented so later ones get assigned higher values. But with a system that deals with so many transactions it may not be that simple. Different databases may implement this differently, so without knowing what the underlying engine is it's hard to say for sure.|
Originally Posted by Ironblade
In theory, it's random.
In practice, it follows a predictable pattern but the only way you can notice this is if you have a group of people posting the same item at the same price, then systematically buying them all to see what happens (which people on The Market channel did). So, for all practical purposes, it's random. |
The key point is that there's no guaranteed ordering mechanism besides the price. If you want to have precedence when posting items for sale, you have to list for a lower price.
I like this uncertainty because it provides a subtle pressure to reduce prices. It can cause prices to creep downward when the peak price has been hit in much the same way they creep upward as demand increases.
I'm not sure how the Markets priorty system works and was looking for a little explanation.
Th reason I ask is that I posted a specific Purple for 125,000,000 to sell last Monday. My friend posted the exact same Purple for the exact same price on Wednesday. Today his sold for 130,000,000 and mine are still waiting to be sold.
How in the world did his sell before mine?