Harrod 1939
重新审视哈罗德1939年《动态理论论文》在经济增长理论中的核心地位，指出其凯恩斯主义基础与新古典主流的分歧，并追问哈罗德的实际贡献。
Harrod's 1939 ‘Essay in Dynamic Theory' is celebrated as one of the foundational papers in the modern theory of economic growth. Linked eternally to Evsey Domar, he appears in the undergraduate and graduate macroeconomics curricula, and his ‘fundamental equation’ appears as the central result of the AK model in modern textbooks. Reading his Essay today, however, the reasons for his centrality are less clear. Looking forward from 1939, we see that the main stream of economic growth theory is built on neoclassical distribution theory rather than on the Keynesian principles Harrod deployed. Looking back, we see that there were many antecedent developments in growth economics, some much closer than Harrod's to contemporary developments. So what, then, did Harrod accomplish?