[经] marketing cost control by product
kòng zhì chǎn pǐn xiāo shòu chéng běn ㄎㄨㄥˋ ㄓˋ ㄔㄢˇ ㄆㄧㄣˇ ㄒㄧㄠ ㄕㄡˋ ㄔㄥˊ ㄅㄣˇ