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Market Calculator triggers its effect during the Phase icon Event. Any modification to the prices before Market Calculator acts will be ignored, since it automatically changes it to ten. Any effect after Market Calculator triggers will modify the price, but from the new price of ten. Since you can choose the order that Icons will trigger, most of the time you can use this to your advantage.
Nice, so I can apply those Syndicate Command ships effect to raise the cost, then use the Market Calculator to set the cost to 10 credits, then apply the 10 credit discount at the sector, making the card a zero cost.