Old but good.
Still digesting it. Had never heard of this one before.
http://www.hacer.org/pdf/Hazlitt00.pdf
The One Lesson:
From this aspect, therefore, the whole of economics can be reduced to a single lesson, and that lesson can be reduced to a single sentence. The art of economics consists in looking not merely at the immediate but at the longer effects of any act or policy; it consists in tracing the consequences of that policy not merely for one group but for all groups.
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