“Money supply” is meaningless, unless you want to confiscate priate savings by inflation to finance massive government spending. Nobody else ive ever read says the gold standard caused the depression, can you refer us to an author, etc?
It seems that if that was the case, then the depression should have been fixed in a jiffy when FDR took us off the gold standard and started following Keynes.
iirc, the book is “The Lords of Finance”. I heard the writer in an interview on pbs recently.