If I argued that Selgin, White, and Lastrapes were nostalgic for the living standards of the 1800s because they seemed to have a slight preference for some of the institutions of the 1800s, what would you think?

Good argument? Bad argument?

What about if Steve Horwitz does it with Paul Krugman?

People, Paul Krugman is an imperfect man. He has many faults. But Paul Krugman is quite well aware that living standards today are better than they were in the 1950s.