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Businessman Munn , a Washington , DC businessman , acquired the seat of Robert Johnson , Jr. , on the New York Stock Exchange for $ 468,000 in June 1930 .
 Munn, New York Stock Exchange
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Munn, New York Stock Exchange