What determines the material value of your work? Nothing but the productive effort of your mind—if you lived on a desert island. The less efficient the thinking of your brain, the less your physical labor would bring you—and you could spend your life on a single routine, collecting a precarious harvest or hunting with bow and arrows, unable to think any further. But when you live in a rational society, where men are free to trade, you receive an incalculable bonus: the material value of your work is determined not only by your effort, but by the effort of the best productive minds who exist in
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