Definition 1.
A chart for which the price scale (usually on the vertical axis) is skewed so that a given distance always represents the same percentage change in price, rather than the same absolute change in price (as is the case for a linear chart). In other words, the distance from 1 to 10 is the same as the distance from 10 to 100 on a logarithmic chart, but the latter distance is ten times greater on a linear chart.
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