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UndergradChemist

I know that at least in many finance circles, log charts are used in order to approximate the idea that from one period to the next, the physical change on the y scale in any period on the chart corresponds approximately to the same percentage change no matter where you're doing the measuring from.

John S.

Also - maybe it's my eyes, but if the y-axis is a log scale, shouldn't the distance between 25 and 30 be smaller than the distance between 20 and 25? Looks to me like they just drew in a line halfway between 20 and 30 and called it 25.

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