Fenring, I never said it was a viable political system. It never has been, really, which is why I support regulation in the attempt to cage the unprincipled animals that dominate the majority of US businesses (and probably elsewhere).
How it could be "enforced" without government is that the men of the mind refuse to do business with the people who are shady, unethical turds. Suppliers would just pass on doing business with Walmart and sign up with Costco. When the government messed up Roark's project he blew the damn thing up. When Rearden was ordered to hand over his patent, he (at first) simply refuses. Wyatt sets fire to his oil fields. While those are dramatic examples, there are more subtle ones in the book. The principle is not to live exclusively for profit, but rather to live for self-interest. These are not the same thing, although they are intertwined. Roark turns down lots of jobs and makes less money in the name of his self-interest.
#1 It should be recognized in their own self interest - Costco regularly gets beaten up by analysts who say that they ought to compensate their employees less so the profit can be sweeter. Costco knows better. Costco has a P/E of 27.7, walmart 17.2. Growth is higher for Costco. It is in Walmarts personal best interest to change their model from crushing employees into the ground to lift them up, but they don't recognize it.
Which is #2, don't work for unethical companies and don't buy their products. We've seen some of this sentiment lately but it needs to go a lot farther. I've had my personal battle with Wells Fargo. I should have cut ties with them over their widespread fraudulent account opening. I haven't, and may not. Partly because I prefer a large bank to credit unions for their various amenties, including great online interface and available ATMs. I already avoid Chase, B ofA, and Citi for previous ethical flaws.
#3, if you're inside a company and spot unethical behaviour, blow the whistle. Put it in the paper, smash their stock prices. Change the optimization strategy and the risk profile by making it really, really painful to blow the rules.
And so, in the meantime, yes I'm going to support a lot of regulation. I want the government crawling through WF looking for more bull*censored*. I want fraud held truly accountable, like when investment firms tell customers to buy a product while they are selling it off. I want Dodd-Frank, Sarbanes-Oxley, and every other damn thing we can throw at them until they straighten up and fly right.