see pages 353-54 of https://procesosdemercado.com/revista/articulo/87/galley/951 by Brecht L. Arnaert (2019):.
“In 1940, Hayek (1940 [1972], 198-199) wrote an article that analyzed and criticized Lange’s model in great detail and explained, point by point, which implications of the model were problematic. Lange was deeply impressed by these critiques, and acknowledged that Hayek had succeeded in raising a series of essential errors and problems with the model: «There is no question that you have succeeded in raising essential problems and in showing gaps in the pure static solution given by me. I intend to work in this subject and give an answer to your paper … sometime in the fall.» (Lange, in a letter to Hayek dated August 31, 1940) Such an answer never came.”
Imagine what would have become of declaring who won the socialist calculation debate if this 1940 letter was better known. Hayek never mentioned the letter. The letter from Lange was found in Lange’s complete works published in 1973 in Polish.

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