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In page Normal backwardation:
"Notable examples of backwardation include:
- Copper circa 1990, apparently arising from market manipulation by Yasuo Hamanaka of Sumitomo Corporation in what has come to be called the "Sumitomo copper affair".[citation needed]
- In 2013, the wholesale commercial gas market entered backwardation during the month of March. The 2-year contract prices fell below the price of 1-year contracts.[1]
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