Site 1
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Site 2
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Site 3
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| Everyone joins The Link Exchange. |
| Since everyone is just starting out, nobody has any credit yet. A Student Center banner is displayed on each person's site. |
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| Site 1 becomes popular. Site 1 earns credit. Site 1's banner is displayed on Site 2 and Site 3. Because neither Site 2 nor Site 3 has any credit, a Student Center banner will be displayed on Site 1 |
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| Site 2 and 3 earn credit for showing Site 1's banner. Their banners also get displayed. |
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| Everyone has credit. Their banners will show up on one another's sites. |
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| Suppose Site 2 and Site 3 still have credit. Their banners will get displayed, but Site 1 will not. Since Site 3 cannot display his own banner, a Student Center banner will be displayed |
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