…There are exceptional cases where the law of demand, which states that a fall in price increases the demand for a good, does not hold true. This is when the good is an inferior good and its income effect exceeds its substitution effect. In this case, the good is called a Giffen good. A consumer who prefers butter to margarine will cut back on margarine purchases as his or her income level rises, and use that money to buy butter instead. … *Some of the terminology explanations that mention "Giffen goods" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…〈価格下落がその財の需要を増加させる〉という需要法則が例外的に成立しない場合がある。それは,財が劣等財で,かつその所得効果が代替効果を上まわる場合であり,このときとくにギッフェン財Giffen goodsと呼ぶ。マーガリンよりバターを好む消費者は,所得水準が上がるにしたがって,マーガリンの購入をひかえ,その分をバターの購入に当てるであろう。… ※「ギッフェン財」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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