They are making it up...and it's what I already said...but you didn't listen.
Economic decisions at a national level owe as much to social winds and chance as anything else. Kahneman has done more than a little work on the matter, and other than his Nobel prize in the subject. He must be dumber than you, since he's shown in physical reviews of transactions that many financiers show a negative correlation to their choices...meaning guesses.
Kahneman has also stated in interviews and shown in studies that most all decision making via groups are worse than if an individual made a choice and stuck with it. His opinion of psychology and economics is that while it may describe something after the fact, it's not particularly useful to predict anything.
Kahneman is similar to Feynman in thinking that "social science" isn't science at all, and cannot be adequately proven by current methods. Now, if they are to be believed, then logic follows that using "economic theory" to "prove" economics is an exercise in mental masturbation at best, and tomfoolery at worst. You can't use social science to prove social science. That's just.......making shit up
Keep dreaming