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可持續采石不是選擇，而是我們對后代的責任。

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:

每個人都有自己的故事。

我們編造恐怖故事來幫自己應對真實的恐怖。

The most important thing in life is to be happy.

The world is full of obvious things which nobody by any chance ever observes.