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.
对照实验(controlled experiments)不适用于manbetx20客户端下载 学领域。但二战结束后东德与西德之间的较量，有一点接近对照实验。这两个国家起源于同一种文化、同一种语言、同一种历史和同一种价值体系。在此后的40年时间里，它们在分隔线的两侧互相竞争。两者间唯一的主要不同在于它们实行的政治及manbetx20客户端下载 制度：一边是中央计划，一边是市场资本主义。
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