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Hm, instead of simply stating that fact, I'd like to see a short explanation on the "why". Because that's the information you need to understand why it might be fine to do so in many cases.

Think that’s an entirely fair point Cédric. You could just elaborate for this one with “axis does not start at zero to help focus on average price trends”

I appreciate the note, but in my work I forgo the baseline all together when not starting from Zero and just rely on the tick marks along the x-axis to frame the plot. I find it a bit too easy to assume a zero-based start if there’s a prominent base axis.

I used a footnote like this for the MakeoverMonday weekly challenge in 2022. I also added a symbol on the axis, inspired by The Economist, which has used this symbol to indicate that the axis doesn’t start at zero.