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Covid 4/21/22: Variants Working Overtime
BackToBaseball10

Clever title for your post!  (Hint:  XTC "... one, two, three, four, five ...")

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Ege Erdil's Shortform
BackToBaseball40

Ln (41.85/40) / ln (60/40) = 11.2%

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3Ege Erdil
It's not the logarithm of the BTC price that is a martingale, it's the BTC price itself, under a risk-neutral measure if that makes you more comfortable (since BTC derivatives would be priced by the same risk-neutral measure pricing BTC itself).