这个装置是他于1949年首先建造的，旨在论证一个经济体系中收入是如何循环流动的。
Educated as an engineer, he later converted to economics. His machine, first built in 1949, is meant to demonstrate the circular flow of income in an economy.
这个装置是他于1949年首先建造的，旨在论证一个经济体系中收入是如何循环流动的。
Educated as an engineer, he later converted to economics. His machine, first built in 1949, is meant to demonstrate the circular flow of income in an economy.
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