Looking at the trading problem from another point of view, to open up the discussion:
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The background trading sim is clearly having a few teething issues. This is not unexpected and from time to time it will probably happen again. The fact that some systems are acting in a slightly irrational manner is not the problem. After all in real life we get all sorts of irrational market behaviour, some due to us not seeing the difference between 2 similar commodities (Saudi oil and Brent Crude as an example), some due to the vagaries of human nature (sudden surges for a particular Christmas toy, slumps in demand because a politician mentions salmonella). So an oddly behaving galactic economy is not the central issue. That being said FD should fix it so it's not totally nuts.
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What is causing problems at the moment is that all we have to base our trading decisions on is import/export data. This can be misleading, as we are finding out, and that is annoying and makes trading difficult.
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One possible solution, which has been requested for other reasons, would be to make the commodity prices visible "remotely", in a manner similar to Slopey's tool. Before anyone flys off the handle..... the first steps would be for your ship to store price data from the station when docked. This price data would be a timestamped snapshot, i.e. it would progressively become outdated. Buying trade info would be the same, it would become outdated. Depending on the speed of the economy it might be useful for a few hours or even a few days. By exposing the prices directly you could make your trading decision on a lot firmer ground. Any anomalies in the background sim (which will appear from time to time) can then be explained away as the usual "oddness" of the market and you can continue to trade.
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The common argument against this is that it removes risk from trading. I'm not sure, after all I know that shipping cocaine from Columbia to New York is wildly profitable, but the risk my cargo is taken from me (plus a healthy dislike of imprisonment) prevent me from capitalising on it. Likewise, I might see a "bubble" in tickle me Elmo toys, but unless I'm fast enough to ship from my source to market by Christmas, I can;t make money.