S&P 500 Index
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Understand Commodity Price Speculation using a logarithmic scale

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.
Beyond Technical AnalysisLOGARITHMICmacro-financescale

The trend is your friend, until it's not
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