See https://bitsharestalk.org/index.php/topic,22851.msg296530.html#msg296530 for an explanation.
Basically, the skewed prices result from rounding errors on orders with very low volume. This is to be expected and not a bug.
The resulting trade price is "opticallly" skewed in the sense that the price of a specific trade is off by a large factor. However, price comparisons should always be done on volume-weighted numbers, in which case these rounding errors will disappear.
I checked the link. The case I refer has nothing to do with this. I mentioned that I had the Lowest Ask trade set and instead the higher one was executed. I distinguished a couple events that reason with the facts.
If you still insist that has something to do with rounding, then you should take rounding off the equation or find a way to execute trades properly if you decide to keep it.
Do not expect widespread adoption if such behavior is continued, explained, expected or not.
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It would be helpful if you were more specific about your experiment. Any attempt to answer an unspecific question is only a shot in the dark.
In the example I cited, the actual trade price as calculated from paid/received amounts was off from the price of the offers on the market. The point here is that the paid/received amounts are calculated by applying the price of the market offer to the amount available for paying, and rounding the result. The rounding is necessary due to lack of precision in the target asset.
If that is not the problem that you verified in your experiment, again, please be more specific about what you perceive as the problem.
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My experience is the following. Names and prices changed, essence remains untouched.
I set a trade of Asset A at an "Ask" price of 1. Gradually it becomes the "Lowest Ask". At that moment the "Market History" section reports trades executed at "Ask" price of 1.5, which is not the "Lowest". So, it is easy to conclude that there is either a bug there, or someone was just inflating the price.
Now since you mentioned a rounding issue as known, never mind if irrelevant to my experience, I just underlined the fact that traders do not like trade engines which produce unexpected results.
That's all and thank you for your time.
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Thanks. Without knowing the details (volume, assets involved) of the trade that happened at 1.5 it is impossible to tell if the rounding issue is the cause.
What I take from this is that we're talking about a UI issue here. Your point that this is unexpected and leads to confusion is absolutely valid. I do not see this as a bug in the market engine, though, but merely as a display problem.
Edit: added comment to github issue https://github.com/cryptonomex/graphene/issues/460#issuecomment-236355266
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