[经] law of the falling tendency of the rate of profit

lì rùn lǜ dì jiǎn fǎ zé ㄌㄧˋ ㄖㄨㄣˋ lv4 ㄉㄧˋ ㄐㄧㄢˇ ㄈㄚˇ ㄗㄜˊ