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一個漢堡能算出匯率? 專家解析大麥克指數

鏡週刊
2025/05/14 | 2分鐘閱讀

市場傳聞用大麥克指數的平價推估,可得出新台幣匯率應該會升到13.3,話題掀熱議,專家提醒,大麥克指數只是概略性的參考,匯率的因素考量很複雜,不能只用漢堡來定論。

「以經濟學人今年1月公布的報告,台幣匯率被低估59%,表示會升值將近60%的幅度,但我認為不至於如此。」前華爾街操盤手闕又上在《錢鏡你家》節目中解釋,前陣子台幣匯率是33,等於是腰斬到16再砍,「有點危言聳聽了,並不合理。」闕又上推估台幣匯率有機會來到26~27的區間。

億元教授鄭廳宜強調,大麥克指數像是一個有趣的指標,幫助人們理解不同國家貨幣匯率的相對價值,但它並不適合作為衡量匯率是否合理的精確工具,而更像是一個輕鬆的、具趣味性的參考,「簡單的說,大麥克指數只適合學校考試用的題目,如果不講清楚,只會造成民眾的恐慌。」他說。

大麥克指數(Big Mac Index)是一個基於購買力平價理論(PPP),來衡量匯率合理性的一種非正式經濟指標。鄭廳宜解釋,它是依據全球各國麥當勞餐廳的大麥克漢堡價格,作為比較基準,看看不同國家的貨幣匯率是否合理。

這次怎麼推出13.3元這個數字的?一個大麥克在美國賣5.99美元,台灣賣新台幣81元,換算下來,等於1美元兌新台幣13.52元,但實際匯率卻在31元附近,代表根據購買力角度,新台幣被嚴重低估。

然而,大麥克指數的購買力平價理論(PPP)的基本假設:一物一價、國際貿易之間不存在交易成本,鄭廳宜認為在現實狀況皆不成立,「不同國家之間相同商品的價格本來就不是一樣的,不可能『一物一價』;而且每個國家的大麥克食材、運輸成本、稅收等,都有差異。」鄭廳宜認為難以用它來準確反映各國貨幣的購買力,因此大麥克指數當然也不成立。

更多精彩內容,請見https://www.youtube.com/shorts/ZVuzylbTeQo

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