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Socialist economists , such as Robin Hahnel , have criticized the term as an ideologically motivated attempt to cast what is in their view the fundamental problems of capitalism as avoidable irregularities .
 Robin Hahnel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robin Hahnel