Economists have always been keen to borrow principles from the hard sciences. In the 19th century Léon Walras and William Stanley Jevons both started their work with a view to importing the insights of physics into the economic sphere. Irving Fisher, the great neoclassical economist whose 1930s work has been rediscovered during this crisis, even wrote his doctoral thesis at the turn of the 20th century under the supervision of a physicist.
經濟學家總是熱衷于借鑒自然科學的基本原理。19世紀，萊昂?瓦爾拉(Léon Walras)和威廉?斯擔利?杰文斯(William Stanley Jevons)都開始著眼于將物理學的真知灼見引入經濟學領域。20世紀初，偉大的新古典主義經濟學家歐文?費雪(Irving Fisher)甚至是在物理學家的指導下撰寫的自己的博士論文。本次危機期間，人們重新發現了費雪上世紀30年代作品的價值。
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