There are two main reasons to use logarithmic scales in charts and graphs.
The first is to respond to skewness towards large values, cases in which one or a few points are much larger than the bulk of the data.
The second is to show percent change or multiplicative factors.
The first is to respond to skewness towards large values, cases in which one or a few points are much larger than the bulk of the data.
The second is to show percent change or multiplicative factors.