An extremely useful chart rarely used by market research professionals is a mekko chart, sometimes referred to as a marimekko chart. It is a stacked bar chart, but (1) the width of the bars varies in a meaningful way and (2) they are lined up next to each other. Usually the bars vary in width according to market share. This means that the surface area of the chart represents the total market, and each component of the chart is proportional to its share of the total market.
Here is an example: (more…)