Apparently Davidson thinks Hayek wrote a book called the Pure Theory of Money in 1931 to which Keynes responded.
Never heard of that one? Neither have I!
At least when Brad DeLong caught Slate making a mistake on this exact same passage from Keynes, they mistook it to be a comment on a book that Hayek actually wrote.
Demand, Supply, and Macroeconomic Models
1 day ago