You could make a God item worth 10000000zc.
That would lay waste on the whole economy once somebody buys it since that's like 1000000zc from the pool gone.
Or not even something worth that much, add in a new ZC item for like 8K and that's at least a solid 100K out of the system which would raise the prices of everything.
Or even just make it so missions give less zc. Less money in the pool. Raises stuff up. Ez.
Getting rid of ZC would just anger all the rich zonians.