HODL explanation
"Gresham's Law, attributed to the English financier Sir Thomas Gresham, expresses the idea that in a system where two types of currencies with equal face value but different intrinsic values circulate, the lower value currency will tend to drive the higher value currency out of circulation.
This law is based on the human behavior of using the lower value currency in everyday transactions and keeping the higher value currency. As a result, the lower value currency remains in circulation while the higher value currency tends to be withdrawn or used in transactions involving higher value.
A classic example would be the use of coins or bills of different precious metals, where the coin with less valuable metal content (the "bad" one) would be used for common payments, while that with higher content (the "good" one) would be reserved or valued more because of its precious metal content."
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