Arithmetic on today's supply, not a forecast. It assumes nothing about whether Zcash could attract that much money.
A coin's market capitalisation is its price multiplied by the number of coins in circulation. Zcash has 16,903,674 ZEC in circulation at $1,141.10 each, which is $19.29B. Holding that supply still and putting UNUS SED LEO's $8.33B in its place gives $492.9952 per ZEC.
Zcash is already worth more than UNUS SED LEO. Moving to the smaller cap would take ZEC down to $492.9952, which is 0.432x of what it trades at now.
Supply is held still, and in practice it moves: coins are minted, burned and unlocked, and every one of those changes the price a given market capitalisation implies. The figure also says nothing about whether the money exists to buy ZEC at that level, which is the part that actually decides a price.
$492.9952 per ZEC. That is UNUS SED LEO's current market capitalisation of $8.33B divided across the 16,903,674 ZEC in circulation.
0.432x. Zcash trades at $1,141.10 today and UNUS SED LEO's market cap is $8.33B against Zcash's $19.29B.
No. It is one division: UNUS SED LEO's market capitalisation spread over the supply of ZEC that exists today. It assumes nothing about whether Zcash could attract that much money, and it holds the supply still when in practice supply changes.
It sets it. Market cap is price times circulating supply, so the same $8.33B of market cap spread over more coins gives a lower price per coin. This uses the 16,903,674 ZEC in circulation now.