Not in my experience to any depth. It may be covered in more depth by the finance section of Fisher, but i doubt it. There is all kinds of empirical evidence contradicting the efficient market hypothesis. Think about people who stayed in stocks with solid PE ratios recently. Most of them outperformed the market based on publicly available information. There are a large number of investors/brokers who regularly outperform financial markets. My favorite being James investment Research.
I am not sure how you are tying that into this as I am talking about government regulation concerning supposed externalities and making the market for firearms less efficient by qualitative measures.
I am not saying I want this regulation, just that I could care less and I haven't seen any stats or studies concerning it.