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SEMI - LOG CHART

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1. Is it best to use a linear or logarithmic price scale?
2. Should I use semi-log charts for trend lines?
3. Could you please explain why log scales are used on the vertical axis of price charts.
4. Which is better, log, semi-log or arithmetic charts?
5. Is there a reason why you mostly use semi-log scaled charts, or is it simply a personal preference?
6. What is the main reason for using semi-log charts rather than linear charts?