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Market capitalization
Also: market cap, market caps, market capitalisation
Price multiplied by circulating supply: a rough measure of a cryptocurrency's total size.
Example: 20 million coins at $100 each is a $2 billion market cap. Market cap is a quick way to compare sizes, not a measure of how much money could actually be withdrawn. See fully diluted valuationFully diluted valuation What a project's market cap would be if every token that will ever exist were already in circulation. for the fully diluted version.