Most people plod through life, having an impact on their family and friends, but not much on the rest of humanity. Rulers and despots can impact most everyone's life, as can those who are responsible for great scientific or engineering breakthroughs. Some musicians and athletes bring pleasure to millions. In other fields, such as economics, it is hard to identify individuals who created much in the way of pleasure or pain, or even directly useful knowledge for his or her fellow man.
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