Controlled experiments are not feasible in economics. But we came close in the competition between East and West Germany after the second world war. Both countries started with the same culture, the same language, the same history and the same value systems. Then for 40 years they competed on opposite sides of a line. The only major difference was their political and economic systems: central planning vs market capitalism.
對照實驗(controlled experiments)不適用于經濟學領域。但二戰結束后東德與西德之間的較量，有一點接近對照實驗。這兩個國家起源于同一種文化、同一種語言、同一種歷史和同一種價值體系。在此后的40年時間里，它們在分隔線的兩側互相競爭。兩者間唯一的主要不同在于它們實行的政治及經濟制度：一邊是中央計劃，一邊是市場資本主義。
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