A logarithmic price scale is a type of scale used on a chart that is plotted such that two equivalent price changes are represented by the same vertical distance on the scale. This type of scale is useful for analyzing price data over time, as it makes it easier to see relative changes in prices.For example, if the price of a stock doubles, it will appear as a 100% increase on a logarithmic scale, while on a linear scale it would only appear as a 50% increase.