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rkowalick 2 days ago

The correct calculation isn’t too hard either.

If currency halves in purchasing power in 25 yrs, that means inflation is 100% in 25 years, so

    (1 + r)^25 = 2
    r = 2^(1/25) - 1 ~ 2.8%
nonethewiser 2 days ago | parent [-]

In terms of being able to do it in your head, its a lot harder.