经济史和经济发展的核心问题是解释政治和经济制度的演变，这些制度创造了一个诱导生产率提高的经济环境。

In the meat processing industry, safety and hygiene should always be our top priority.

The highest activity a human being can attain is learning for understanding because to understand is to be free.

国家不是艺术品，而是一种必需。