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I don't Libertarianism is very scientific. It's at best pseudoscience. It handwaves a good number of the problems with business practices in the 21st century.
It can't work in a world where we don't make our own foods. Without government "interference" I'm not sure that an average American could tell whether his Mac & Cheese had melmate in it, whether his toothpaste had gylcerine in it. We get our food from around the world, and we can't go ourselves to check out the growing conditions or manufacture conditions. Libertarianism never takes this into account. When Smith wrote Wealth of Nations, most people were famers or local craftsmen. Things were made locally and you could inspect the goods.
It does a crappy job of protecting the workers. When libertarianism met the industrial age, we saw child labor and shitty safety records. People losing limbs and ending up with nothing. Attempts at unionisation ended in gunfire.
Long story short, the economic end of Libertarianism doesn't work when you're dealing with an industrial society. It was designed for a time when you bought local or made your own. It was designed for workshops not factories. And it hasn't kept up with the times.