collapse

崩壊　—　Phenomena

A framework ceasing to hold together.

Visigothic gold tremissisc. 575–711 (the age of striking the king's name) Merovingian gold tremissis6th–7th century Banknote of the Banque Royale1720

The collapse of a currency does not mean the currency disappears. It is when people stop using it and switch to foreign currencies or goods.