[Haskell-cafe] complex state code

I'm working on some code where I have some complex state. This is the first time I've dealt with anything like this in haskell. If anyone would review my code and let me know if there are ways I could do this better, cleaner, in a more idiomatic way, etc, I would greatly appreciate it. http://www.thenewsh.com/~newsham/Market.hs Tim Newsham http://www.thenewsh.com/~newsham/