现代经济学是建立在亚当-斯密斯的体系上，其关键是分布性系统、市场、和看不见的手【7】。后来在经济学上作出巨大贡献的李嘉图，凯恩斯，弗里德曼都是在这个框架下作出的。马克思非常狂妄，要建立一个不同的经济学体系。从理论上来说，建立一个取代亚当-斯密斯的经济体系的难度非常高当然也不是绝对不可能。但是马克思不具有这样的才能。以才能来讲凯恩斯是天才，比马克思的才能要高数倍。凯恩斯仍然在亚当-斯密斯的体系内工作，作出了巨大贡献。下面是我在网上看到凯恩斯关于马克思主义的评论：“How can I accept the Communist doctrine, which sets up as its bible, above and beyond criticism, an obsolete textbook which I know not only to be scientifically erroneous but without interest or application to the modern world? How can I adopt a creed which, preferring the mud to the fish, exalts the boorish proletariat above the bourgeoisie and the intelligentsia, who with all their faults, are the quality of life and surely carry the seeds of all human achievement? Even if we need a religion, how can we find it in the turbid rubbish of the red bookshop? It is hard for an educated, decent, intelligent son of Western Europe to find his ideals here, unless he has first suffered some strange and horrid process of conversion which has changed all his values.”这里可以看出凯恩斯对马克思学说的极端鄙视。最后一句：一个受过教育的，正常的，有智力的西欧人难以在马克思主义里找到理想，除非他先前已经遭受过某种奇怪的、可怕的改变了他的所有价值的转变。在凯恩斯看来，信仰马克思主义的人或者智力有问题，或者曾被洗脑。这句话值得大陆学人认真考虑。
注释：
【1】Paul A. Samuelson and William D. Nordhaus, "Economics", McGraw-Hill; 12th Ed. 1985, pp.771-779.
【2】Rod Hague, Martin Harrop, "Political Science: A Comparative Introduction", Palgrave Macmillan; 6th Edition, 2010, Chapter 8.
【3】Paul A. Samuelson and William D. Nordhaus, "Economics", McGraw-Hill, Irwin, c2005 18th ed.
【4】N. Gregory Mankiw, “Principles of Macroeconomics,” South-Western College Pub; 7 ed. 2010，p.49.
【5】美国经济的劳工收益分配：过去与现在 http://han-jialiang.hxwk.org/?p=639
【6】韩家亮：贫富差别——历史与现在 http://my.cnd.org/modules/wfsection/article.php?articleid=35425
【7】韩家亮：了解经济学的另一角度：多体问题的优化和研究的范式 http://my.cnd.org/modules/wfsection/article.php?articleid=34676