Use and Abuse of Graphs

The pie chart of the top four market shares (Pie 2) is bad, because the total should be 100% of market share, which means that an “other” category (as in Pie 3) is needed. Using an exploded pie (Pie 4) is snazzy but unnecessary, and it makes it more difficult to do comparisons. All that matters is the size of the top surface, but the eye ... ................
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