我是世界上最幸福的人。也許其他人以前說過這樣的話，但沒有一個說得那么有道理。我甚至比簡還要快樂；她只是微笑，我是大笑。
Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics:
聰明人的問題是，他們在愚蠢的人看來就像瘋子。
The only limit to our realization of tomorrow will be our doubts of today.