3284
Trading sources generally agreed it would be cost-effective to take the copper back into a depleted central reserve as it had already served its purpose in taking advantage of long-term backwardation on the London Metal Exchange ( LME ) .
 LME, London Metal Exchange
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 LME, London Metal Exchange