The old-style classical liberals reveled in the fact that all these "impersonal forces" [of the market economy] worked without anyone really being aware of them, or having to understand them. The checkout lady at the store just shows up, pushes buttons, gets paid, and stays or leaves based on her assessment of her own well-being. Everyone else does the same. The pursuit of self-interest generates this amazing global matrix that benefits everyone.
The old liberals reveled in the fact that no one had to understand it, but then the system itself came under attack, and needed defense. It had to be understood to be explained, and explained in order to be preserved.
This is why Ludwig von Mises set out to revise liberal doctrine. It is not enough that people participate unknowingly in the market economy. They must understand it, and see how, and precisely how, their smallest and selfish contribution leads to the general good, and, moreover, they must desire that general good.
All of which is to say that in an enlightened world, it would be a good thing for that cashier to understand economics from the point of view of those who pay her. It would be good for striking workers to understand how they are harming not only their bosses but also themselves. It would be good for voters to see how supporting government benefits for themselves harms society at large.
An economically literate public is the foundation for keeping that amazing and wild machine called the market working and functioning for the benefit of the whole of humanity.
~ Jeffrey A. Tucker, "The Other Side of the Transaction," Mises.org, November 12, 2007