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图A-20 棉花
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资料来源：Reprinted with permission.1988by Commodity Perspective，20South Wacker Drive，Suite 1820，Chicago，IL 60606
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图A-21 加拿大元
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资料来源：Reprinted with permission.1988by Commodity Perspective，20South Wacker Drive，Suite 1820，Chicago，IL 60606
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图A-22 白银
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资料来源：Reprinted with permission.1988by Commodity Perspective，20South Wacker Drive，Suite 1820，Chicago，IL 60606
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图A-23 小麦
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资料来源：Reprinted with permission.1988by Commodity Perspective，20South Wacker Drive，Suite 1820，Chicago，IL 60606
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图A-24 猪腩
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资料来源：Reprinted with permission.1988by Commodity Perspective，20South Wacker Drive，Suite 1820，Chicago，IL 60606
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图A-25 可可豆
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资料来源：Reprinted with permission.1988by Commodity Perspective，20South Wacker Drive，Suite 1820，Chicago，IL 60606
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