One place where a "quantum approach" that takes the observer, and changes in the observer into account is: Money supply being multiplied by banks isn't an iron

One place where a "quantum approach" that takes the observer, and changes in the observer into account is: Money supply being multiplied by banks isn't an iron law. Deflation can start merely by a change in attitude. My grandparents lived through the depression and put money in the bank as a way of forgetting they had it; so they would not spend it. That's the opposite of the multiplier effect. This is part of the "animal spirits" effect that Keynes mentioned re economic depressions. Had he or others done experiments to figure out more precisely what that meant, and how it occured this "quantum revolution" might have occured earlier. Keynes is mentioned in the article but puzzlingly, "animal spirits" isn't. Sexual selection of males by females matters a great deal (to economics re animal spirits.) In good times high spending males are attractive (regardless of borrowing); in (or after) bad times high saving males are in more demand.