Rarely do I get totally engrossed in watching a debate, especially one that's almost 2 hours long. But I recently discovered this 1981 debate between economist David Friedman and philosopher George Smith on the issue: Ethics vs. Economics as a Foundation for Liberty. Both David and George are at the top of their game.
One of my favorites is at the 10:27 to about the 11:30 point. I would tell you but David says it so well, in his impish way, that I don't want to ruin it.
Two other interesting highlights.
At the 1:44:32 point, a very young-looking Jeff Hummel asks a tough question of David Friedman that I think Friedman answers well.
At the 1:51:30 point, feminist Wendy McElroy asks David a question. Again, I think David handled it well.