derrr.... why would state property decrease inflation... the gov would print what $ it needs much like our own(USA) does. In a true free market (not that the civ one is Freemarket, i changed the name to Corporatism) Competing banks would have to worry about runs and would be forced to hold more in reserves thus slowing the credit expansion thus inflation.
of course the civ idea of inflation is completely different from reality so go ahead how ever i would think you will require sdk changes to allow civics to influence inflation.