Comment: right and worng.

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In reply to comment: thks.. (see in situ)

right and worng.

You are right in that there is no fixed market cap. it fluctuates by the second.

You are wrong that it is a guess. The 2 numbers in the equation are always known.

the number of coins in existence is known. You can see it ticking along here in the top left hand corner.
http://bitcoinwatch.com/

The price is given by the weighted average of the magor exchanges.(same URL, right hand side table.)

Keep up the great questions. :) Everyone learns when great questions are asked.

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