Without a government, there can be no corporations. A corporation is a creature of regulation. You can already operate a business under fewer regulations by forming a sole proprietorship or general partnership. Why don't people do that? The entitlement of liability limitation afforded by corporate regulation is what makes it possible for businesses to be bigger than a certain nominal size. Something like the "sugar industry" might not exist at all without that entitlement.

Likewise, if the individuals forming a sugar industry marketing or lobbying entity could be held personally liable for the actions of that entity, it probably wouldn't exist. That's the closest thing I can think of to a concept of business law in a libertarian sense: If you own a certain fraction of General Motors, then you're responsible for a fraction of GM's debts, if those debts exceed its assets.