“…The National Banking Era saw a secular fall in amount of Treasuries outstanding relative to GDP, as shown 27. There is a large literature on the underissuance puzzle that we have not discussed, for example, Bell (1912), Cagan (1965), Goodhart (1965), Cagan and Schwartz (1991), Duggar and Rost (1969), Champ, Wallace, and Weber (1992), and Wallace and Zhu (2007). None of these explanation are mutually exclusive with those we have discussed.…”