It is now understood that, no matter how the economy had developed at that time, people then carried out extensively the hasen (to melt coins to use as a raw material) so that at least a few thousand million pieces of issued coins could hardly be retrieved and the remaining coins were compelled to degraded values.
少なくとも数億枚は発行が確認されている銭が、いくら経済発展があるとはいえなかなか回収できず、品位を下げざるをえなかったのは、破銭（銭を溶かして銅地金として利用する行為）が広く行われたためと理解される。