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The junk market , which mushroomed to $ 200 billion from less than $ 2 billion at the start of the decade , has been declining for months as issuers have stumbled under the weight of hefty interest payments .
 $ 200 billion, less than $ 2 billion, the start of the decade, months
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 $ 200 billion, less than $ 2 billion, the start of the decade, months