Why not consider how much value there can be on Earth?

10 billion people stable global population
45 years of work productivity with 75 years life expectancy (monetary supply should hold a lifetime of value)
50.000 USD GDP per average futuristic civilized capita someday in the future using current money
100% global privatization
20M Bitcoin (some are lost, irrecoverable, Satoshi doesn't cash out everything at once, not 2138 AD yet, etc)
90% blockchain market share
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1 012 500 000 USD

One billion dollars in 2014's paper money.