111923
Leon Trotsky believed that central planners , regardless of their intellectual capacity , operated without the input and participation of the millions of people who participate in the economy and so they would be unable to respond to local conditions quickly enough to effectively coordinate all economic activity .
 Leon Trotsky
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:
 Leon Trotsky