成功不是关于成为最好的,而是关于不断变得更好。
The strength of a nation's institutions is not just in their formal rules, but in the informal norms that govern behavior and the degree to which they are internalized by the population.
柠檬问题是指买家无法确定产品质量,因此只愿意支付反映平均质量的价格。