File:Marginal External Cost.jpg
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Marginal_External_Cost.jpg (620 × 326 pixels, file size: 17 KB, MIME type: image/jpeg)
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:02, 30 September 2010 | | 620 × 326 (17 KB) | JiayangWang (talk | contribs) | Reverted to version as of 01:01, 30 September 2010 |
| 01:02, 30 September 2010 |  | 620 × 326 (17 KB) | JiayangWang (talk | contribs) | ||
| 01:01, 30 September 2010 |  | 620 × 326 (17 KB) | JiayangWang (talk | contribs) |
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