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This diagram is a series of dots representing people who are connected to other people (dots) by lines. The dots and lines spread out gradually to the right, showing the spread of participation. This demonstrates a multiplier effect as one person’s communication to three others is then spread by each of these to another three, and so on.

Time and effort, or cost, increases as the spread grows wider, as does the money gathered or yield.

 2.4 The contribution multiplier