Have you ever heard of a Free Market? I don't mean the buzzword political idiots throw around, but the actual economic ideal of Free Market.
Essentially it's an economic utopia where anyone can enter any product/service market and compete.
Like all utopias, it never has existed, and probably never will.
Look at the costs to enter into such a business, and then look at the regulations that prevent you from doing so in many places. Those are barriers to entry that prevent most of us from ever doing such a thing. We do NOT have a Free Market, we have something else, but I'm not sure which is the right economist term for it.
So just saying "go start your own business" or "go do it yourself" isn't feasible in this, and most other circumstances we might want to.
I know they covered all this stuff back in my high school days. Have they really fallen that far in education quality now?