Today is a very good excuse to post this video, which I also came upon today, posted on Twitter on the occasion of Richard Thaler winning the Nobel Prize in economics. Thaler and recent Nobelist Eugene Fama have a very pleasant, wide-ranging, and clear discussion about, and debate over, market efficiency.
This is also a good excuse to link to an essay on the history of the divergence between experimental and behavioural economics. The differences between the two might seem to be superficial, but they turn out to be fundamental.