short concept:
after and during each guild war the local and or global economy of planeshift become depressed for a little bit.
long concept:
as many of the you know a war plays total havoc on economies. both during and after the war much of the effort is focused on that.
in highly specialized economies, and i think ps is one of them, such effects are more pronouced. a smaller war will produce larger effects. at the scale of ps a guild war should produce noticable and large effects on the general economy.
based on that, both during and after guild wars there should both increased prices and a lack of availablity of many, if not all, goods that we are able to purchase. the effects are additive, but decrease over time.
inaddition neighbouring cities should see some of the effects as well. a slight increase in prices, as well as a slight decrease in availablity. as merchants in that city see the chance to make more money by shipping some goods to the war torn city.
yeah, this will be one of those really far down the road implementations. but, it maybe interesting to discuss it atleast.