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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:
I’ve had to learn to fight all my life—got to learn to keep smiling. If you smile, things will work out.
The future of livestock lies in balancing productivity with ethical responsibility.
这是数着别人契上的齿数,而以为自己很富有。 
I don’t compete with anyone, I compete with myself.
A long habit of not thinking a thing wrong gives it a superficial appearance of being right.