Well, this isn\'t too bad of an idea, but there needs to be a lot more details first created in the game for this to work well and with minimal corruption.
First of all, you need to emphasize that \"going public\" (if the shares are like stocks) shouldn\'t necessarily be a very common thing with guilds. Also, you need some sort of interesting benefits for the guild that goes public (BTW, for all of you who don\'t know, going public means entering the stock market and selling shares of your company). Let\'s discuss some interesting, but not too complicated ideas for this.
Also, this selling shares idea could really work well if there are, indeed, interest rates and dividents in banks, and a guild has a big bank account, managed either by a guild treasurer+leader (in big guilds) or by all the guild members (in small, very private guilds). What I mean is that you\'ll have the option to manage a guild bank account collectively or by only certain members of the guild. The money you put in the account, the items you put in the account (as long as they stay there?) and maybe some other factors (successful raids of some sort, maybe) would increase the price of the shares.
Don\'t forget that you somehow need to control the NUMBER of shares, but I imagine there doesn\'t need to be a crazy system for that. For example, the more members you have, the more shares you sell, and as members join, the more shares you can sell. You\'d get 4 shares that are up for sale per member of the guild, for example.
Also, don\'t forget supply/demand, which is what stocks function on. If we had an economical branch of volunteers that would help figure the economy out, and help developers integrate all these neat ideas into the game, we could definitely make a realistic supply/demand model with the guild shares system.
EDIT: a couple other thoughts:
First of all, I just want to say that because not all guilds have to go public, I don\'t think guilds taking over all other guilds would really be a HUGE issue. Secondly, it would be nice for a sort of natural faction of guilds to form, based on financial fundings, hehe.
One other thing: I just realized a huge exploit that could happen with the bank idea. People could first keep all their guild money on personal bank accounts or just on the characters, have a friendly guild buy shares of their guilds for REALLY cheap, and then PUT lots of money in the bank accounts to raise the prices of the stocks.
However, this could EASILY be regulated. We would surely have economic advisors and \"guild market regulators\" in the game that could take care of suspicious activity and check up on rumors (as well as look through records for crazy things like share prices dramatically rising).
Anyway, please reply to this thread with your opinions about some details of this issue. It sounds potentially awesome.