Alex I saw you mentioning in other threads that you think the economy takes too long to reach its long tail.
While making my economy mod, I noticed 3 important factors in this:
1) current economy update speed is rather slow (in my mod I set it to 1 day, and saw no significant performance degradation)
2) the "rolling" average factor is too low, at 10% it means that if a market could not buy anything and started with an stock of "100.000" would take 110 updates to get to zero, as you can imagine 110 updates with 30 days to update is a LOOOOOONG time.
3) Production has some circular dependencies, that although usually is fine, combined with the last 2 facts make it a serious problem.
Example: The Autofactory makes machines from metal and rare metal, volatiles and organics, many producers of those take machines as input, for example volatiles explicitly produce slower if it don't meet its machine demand, so to step up production to maximum the autofactory need all those materials, then the material makers need the little extra machine made, to output a little extra materials, to output a little extra machine, and so on...
I need more testing, but to stabilize those "loops" it is seemly needed about 90 updates, thus on vanilla about 90*30 days (this mean 3.75 hours in real world time).