研究会開催のお知らせ

講師：Jochen Reb先生（Singapore Management University）
時間：１２月２１日（日）、１６時〜１８時頃（終了後有志で会食）
場所：東京工業大学大岡山キャンパス、西９号館７０６室

講師紹介：Jochen Reb先生には、2007年10月19日にも本研究会で
ご発表頂いています。行動的意思決定の分野で、Regret Theoryを
ベースにした研究の最先端に取り組まれ、次回のご発表もその
流れを汲む内容になると思われます。

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認知的統計的意思決定論研究会、メイルリスト登録諸兄、

幹事役の山岸侯彦＠東工大です。

来る１２月２１日の研究会のアブストラクトをお届けします。
多くの皆様のご参加を、お待ちしております。

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講師：Jochen Reb先生（Singapore Management University）
時間：１２月２１日（日）、１６時〜１８時頃（終了後有志で会食）
場所：東京工業大学大岡山キャンパス、西９号館７０６室
　　　（電話03-5734-2934、東工大構内から内線2934）

      A New Look at the Endowment Effect:
The Role of Possession and Psychological Ownership

簡略アブストラクト
The endowment effect (Thaler, 1980) is one of the most
well-known findings in behavioral decision research. The
effect refers to the finding that buyers' willingness to
pay (WTP) for an object tends to be significantly lower than
sellers' willingness to accept (WTA) for the same object.
Researchers have typically assumed that the effect is caused
by differences in factual ownership. However, I present
research that suggests that it is subjective feelings of
ownership, rather than factual ownership per se, that cause
the endowment effect.

長文版アブストラクト
Research in judgment and decision making generally ignores
the distinction between factual and subjective feelings of
ownership, tacitly assuming that the two correspond closely.
The present research suggests that this assumption might be
usefully reexamined. In two experiments on the endowment
effect we examine the role of subjective ownership by
independently manipulating factual ownership and possession
of an object. This allowed us to disentangle the effects of
these two factors, which are typically confounded. We found
a significant effect of possession, but not of factual
ownership, on monetary valuation of the object. Moreover,
this effect was mediated by participants' feelings of
ownership, which were enhanced by the physical possession
of the object. Thus, the endowment effect did not rely on
factual ownership per se but was the result of subjective
feelings of ownership induced by possession of the object.
It is these feelings of ownership that appeared to lead
individuals to include the object into their endowment and
to shift their reference point accordingly. Potential
implications and directions for future research are
discussed.