Every time you ask for an option you increase the code base.
I had my whole nation go into revolt when this change was sprung on me. There did not seem to be any discussion.
There are three buildings that
I think should be changed to have unhappiness per population I don't know if that is possible. The three are bazaar, marketplace and grocer. In each case when haggling over the price of things is done one or both groups involved come out of the deal unsatisfied. This unhappiness would drop by half when the idea of "fixed price" came to be common.
Similarly while scales and courts of law reduce crime and the unhappiness caused by crime they cause a small amount of unhappiness in themselves since they limit the freedom of people to cheat or take advantage of others.
edit by "fixed price" I mean the idea that the price tag on the goods is the price you will pay not some governmental fixing of prices but what the store holder decides based on competition.