I'd say the main point of the talk is out intuition is often wrong therefore it should be tested whenever possible.

It seems obvious, but more often when not the wrong assumptions are not tested.

* When reminded of their own (self-image) morality, people cheat less

* Magnitude of cheating is independent from a risk to be caught (people are predictably irrational)

* When a member of a group demonstrates cheating behaviour, members cheat more. When non-member of a group demonstrates cheating, people cheat less

From the above it follows that players on the stock market are doomed (or blessed) to cheat.