51708
If the difference becomes significant , the issuing authority may decide to withdraw these coins from circulation , possibly issuing new equivalents with a different composition , or the public may decide to melt the coins down or hoard them ( see Gresham 's law ) .
 Gresham
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gresham