Yes, libertarians do. Dynamic markets have improved lives for Americans of all classes. So much so, that we’re far less interested in economic classes than other peoples are. Progress so considerable that wealth from a century ago offered less, in so many ways, than an average income today.
We’ll gladly leave a defense of stagnation to others…
The measures that matter are not simply across time, though, but between communities at the same time. By that standard, a small city like Whitewater is struggling.
See, Libertarians and Economists Think Economic Progress Is Very Cool | The Atlantic Wire.