答案是 D:larger; larger。兩地木材越接近替代品,Southeast timber 價格變動越會帶動 Northwest timber 需求轉移;Northwest timber 自己漲價時也更容易失去買家,但 larger 只是方向判斷,不代表彈性一定大於 1。 第一個 larger 是 cross price elasticity:一種商品需求量對另一種商品價格變動的反應;替代品越像,轉買反應越強。

Create a landscape editorial hero image for this Studio Global article: Northwest 與 Southeast Timber:為什麼替代性越高答案是 larger; larger?. Article summary: 答案是 D:larger; larger。Northwest 與 Southeast timber 越接近替代品,兩地之間的交叉價格彈性會變大;Northwest timber 自己漲價時也更容易失去買家,所以自身需求彈性也變大,但這只是方向判斷,不代表彈性一定大於 1 [4], [7], [2]。. Topic tags: economics, microeconomics, elasticity, cross price elasticity, price elasticity. Reference image context from search candidates: Reference image 1: visual subject "Grow your personal wealth today and start saving for tomorrow with personalized banking services from Northwest Bank of Rockford. With a mortgage loan from the team at Northwest Ba" source context "Banking & Lending Winnebago, IL | Northwest Bank of Rockford" Reference image 2: visual subject "Grow your personal wealth today and start saving for tomorrow with personalized banking services from Northwest Bank of Rockford.
這題不是要背答案,而是要分清楚兩個空格各自在問什麼。題目把「Northwest timber 與 Southeast timber 的替代性變高」同時連到兩個概念:兩地木材之間的交叉價格需求彈性,以及 Northwest timber 對自身價格變動的需求彈性 [4]。把兩者分開看,答案就是 D:larger; larger。
| 空格 | 實際在問什麼 | 為什麼是 larger |
|---|---|---|
| 第一格:cross elasticity of demand between timber from the two regions | Southeast timber 的價格變動,會讓 Northwest timber 的需求量反應多大 | 交叉價格彈性衡量一種商品需求量對另一種商品價格變動的反應;替代品越接近,轉買反應越明顯 [ |
| 第二格:elasticity of demand for Northwest timber | Northwest timber 自己價格變動時,需求量反應多大 | 可用替代品的數量與品質會影響需求價格彈性;Southeast timber 越像替代品,Northwest timber 漲價時買家越容易轉走 [ |
所以,第一個 larger 是「兩地木材之間的需求轉移更強」;第二個 larger 是「Northwest timber 自己漲價時,需求量下降更敏感」。
交叉價格需求彈性衡量的是:一種商品的需求量,如何回應另一種商品的價格變動 [7]。在這題中,可以把它理解為:
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答案是 D:larger; larger。兩地木材越接近替代品,Southeast timber 價格變動越會帶動 Northwest timber 需求轉移;Northwest timber 自己漲價時也更容易失去買家,但 larger 只是方向判斷,不代表彈性一定大於 1。
答案是 D:larger; larger。兩地木材越接近替代品,Southeast timber 價格變動越會帶動 Northwest timber 需求轉移;Northwest timber 自己漲價時也更容易失去買家,但 larger 只是方向判斷,不代表彈性一定大於 1。 第一個 larger 是 cross price elasticity:一種商品需求量對另一種商品價格變動的反應;替代品越像,轉買反應越強。
第二個 larger 是 own price demand elasticity:可用替代品的數量與品質會影響需求價格彈性,替代品越好,買家越容易因漲價轉走。
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Northwest timber 需求量的百分比變化
÷ Southeast timber 價格的百分比變化如果 Northwest timber 和 Southeast timber 是替代品,買家會根據相對價格在兩者之間轉換。OpenStax 對替代品的說明是:當兩種商品是 substitutes,其中一種變得相對便宜時,消費者會轉向它,並減少另一種替代品的消費 [19]。
因此,兩地木材越相似、越容易互相替代,Southeast timber 的價格變動就越會影響 Northwest timber 的需求量。這就是第一個空格填 larger 的原因。
第二個空格不是再問 Southeast timber 的價格對 Northwest timber 的影響,而是問 Northwest timber 對自己價格變動的敏感度:如果 Northwest timber 自己漲價,它的需求量會下降多少。
這裡的關鍵仍然是替代品。關於 softwood lumber demand 的文獻摘要指出,需求價格彈性會受可用替代品的數量與品質影響 [2]。所以,當 Southeast timber 成為 Northwest timber 更接近的替代品時,Northwest timber 一漲價,買家就更容易改買 Southeast timber。
可以用一條簡單鏈條記住:
Southeast timber 更像 Northwest timber 的替代品
→ Northwest timber 漲價時,買家更容易轉向 Southeast timber
→ Northwest timber 需求量下降得更明顯
→ Northwest timber 的需求價格彈性變大所以第二個空格同樣是 larger。
選 larger; smaller 的錯誤在第二格。替代品變好,不會讓 Northwest timber 的需求變得更不敏感;相反,替代品越容易取得、品質越接近,買家越容易因為 Northwest timber 漲價而轉買其他木材 [2]。
換句話說:
這題把兩個概念放在同一句話裡,所以容易混淆。但兩者的方向都指向同一件事:替代性越高,需求對價格變動越敏感。
這題的 larger 是相對概念,意思是「比替代性較低時更大」。題目只給出替代性提高這個方向,沒有給價格變化或需求量變化數字,因此不能計算出精確彈性值 [4]。
這也不代表 Northwest timber 的需求價格彈性一定大於 1。softwood lumber demand 的文獻摘要提到,多數二戰後的 softwood lumber 需求研究認為其價格彈性是 inelastic,也就是小於 1 [2]。這不會推翻本題答案,因為彈性可以「變大」,但仍然可能小於 1。
替代性越高 → cross-price elasticity 越大
替代品越好 → own-price demand elasticity 越大套用到 Northwest timber 與 Southeast timber:兩地木材越可互相替代,兩地之間的交叉價格彈性越大;Northwest timber 自己漲價時,買家也越容易轉向 Southeast timber。因此答案是 D:larger; larger [4], [
7], [
2]。