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(A)conform to
(B)specialize in
(C)touch upon
(D)wear away

 According to the law of demand, when price goes up, demand goes down and vice versa. Thus, only goods which do not touch upon the law of demand, such as Veblen goods for their exclusive nature and appeal as a status symbol, have a positive PED.

根據需求法則，當價格上漲時，需求下降，反之亦然。 因此，只要不涉及需求法則的商品，如維布倫商品以其獨特性和吸引力作為象徵，才達成積極性的PED。

(A)conform to 符合

(B)specialize in 專攻

(C)touch upon 觸及、涉及、提到(話題)

(D)wear away 磨損、(時光)流逝

vice versa   adv.【拉】反之亦然

exclusive 獨特的、唯一的

conform to 遵從

Thus, only goods which do not conform to the law of demand, such as Veblen goods for their exclusive nature and appeal as a status symbol, have a positive PED.
因此，只有不順從需求法則的商品才有正值的PED，例如以獨特性及吸引力為象徵的維布倫商品 

(A) 符合

(B) 專注于

(C) 觸摸

(D) 磨損