One #Bitcoin is always worth the same, namely 1/21,000,000. It is the fiat currency that fluctuates and loses value over time, because new notes are printed daily.

Phew

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That's partly true. What is the estimated amount of "lost" and unrecoverable BTC due to sat-dust on wallet purge, or from lost keys, or even simple abandonment? Let's call this value LOST_BTC.

I think 1BTC = (2.1*10^7 - LOST_BTC). Thus 1BTC is worth more than 1/21,000,000.