1)銅為重要工業原料，用它的價格作為評估全球製造業需求的風向球，銅價漲、工業復甦，銅價跌、工業下滑。
2)觀察銅金比:
2009 Mar.~2011 Oct. (32個月) 低點到鋒值(24個月)
2011 Oct.~2016 Aug. (59個月) 低點到鋒值(28個月)
2016 Aug.~2020 Apl.(44個月) 低點到鋒值(22個月)
結論:投資銅
1. 完整週期從32個月到59個月不等，本次抓最低32個月
2.低點上漲到鋒值，至少是周期的一半
3.本次低點2020 Apl.，假設32個月到2022年Dec.，低點到鋒值16個月，代表銅至少會從2020 Apl.漲到2021年 Aug.
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