[经] stability of monetary unit assumption

bì zhí bù biàn de jiǎ dìng ㄅㄧˋ ㄓˊ ㄅㄨˋ ㄅㄧㄢˋ ㄉㄜ˙ ㄐㄧㄚˇ ㄉㄧㄥˋ