I am not sure why are discussing financial consequences for IC when it has funds to fund system developments (Okinawa, remember). Also, don't forget that Rheinland probably pays insurance costs in advance, so IC already has part of Rheinland's economy in its pockets. IC as shipping - meh, I don't even count that to have any effect on any sides if we take into account only official faction, which rarely visits Rheinland. And if it does, sometimes smuggles stuff to Liberty. )))
EDIT: I believe that both sides would suffer small short-time loses, but both would suffer long-term loses. Rheinland would be more devastated in long term if compared to IC, imho.