50619
According to Tibor Machan , " [ w ] ithout a market in which allocations can be made in obedience to the law of supply and demand , it is difficult or impossible to funnel resources with respect to actual human preferences and goals " .
 Tibor Machan
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:
 Tibor Machan