In fact, he actually emphasized a concept that was first stated by a French philosopher Louis Blanc in the mid-nineteenth century.

事实上，他特别看重,一个由法国哲学家路易·勃朗,在十九世纪中期,率先提出的概念。

耶鲁公开课 - 金融市场课程节选

Blanc said the ideal society is based on the principle of, and now I quote, "From each according to his abilities, to each according to his needs."

勃朗说理想国,应建立在这样的原则上，以下由我引用，各尽所能，按需分配“

耶鲁公开课 - 金融市场课程节选

Karl Marx quoted Blanc, but he didn't credit Blanc.

卡尔·马克思引用了勃朗的话，但他没注明出自勃朗。

耶鲁公开课 - 金融市场课程节选