Guess you'd have to be more clear on what you mean by pure capitalism. Free markets (ie free societies) require a government and laws to ensure the freedom required for them to operate. Let's dispense with pretending free markets are anarchy, k?
In a country with pure or unfettered capitalism there would be no regulatory laws and regulations that hindered commerce, no enforceable legal safety standards for food, medicine, cars, and other consumer products.
That's all more or less how I see it. But... anarchy?
The only thing I would disagree with in your characterization is the notion that a free market implies no laws that impede commerce. That implies the law is subordinate to commerce, and that's not so. The law should be protect liberty and justice, regardless of the impact on commerce. If, for example, a business is defiling the commons with pollution government
should impede them, regardless of how it impacts their bottom line.
Under such a system the most powerful corporations would force the competition out of business destroying the free market.
Now this is worth discussing. Especially since I see good reason to be concerned with the opposite. It's virtually impossible for a business to exert the kind of control you're talking about legally. It takes a complicit government to make it happen. The regulatory regime, for purely pragmatic reasons (politicians generally aren't experts in the fields they're regulating), almost always works in 'partnership' with the dominant players in the industry they are regulating. And those dominant businesses exploit that relationship to control their markets - to thwart competition from other businesses, and prohibit alternatives for customers.