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For example , while the best-known proposed forms ( with taxation and distribution ) are usually thought of as left-leaning ideas that right-leaning people try to defend against , other forms have been proposed even by libertarians , such as von Hayek and Friedman .
 von Hayek, Friedman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 von Hayek, Friedman