Guidelines: Pie charts should be converted into accessible tables. It is not necessary to describe the visual attributes of the charts, e.g., red wedge, blue lines, etc., unless there is an explicit ...

Pie charts present data in a circular pattern, making it difficult to make comparisons when there are many groups, or when groups are similar in size. They can also misrepresent data entirely ...

The chart below shows the most recent market shares of each pie in the U.S. market structure. The circles are sized relative to their contribution to market-wide volumes traded.