The term 'Market Capitalisation' is the total dollar market value of a Company's shares. It can be calculated by multiplying the number of shares by the price per share.
For example, as I type Bitcoin (BTC) has a Circulating Supply of 18,053,762 BTC. The price of one BTC currently is $8,529.52, making the Market Capitalisation $153,989,988,495.

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