研討日期	2022年9月12日上午10:30~ 12:30
研討地點	國立臺灣大學社會科學院606教室
主講題目 Title of the paper	On the certification of credence goods
作者 Authors of the paper	Ya-Po Yang
文獻出處 Journal, vol.(issue), pp	Ya-Po Yang
主講人	Ya-Po Yang
參加人員	Ya-Po Yang、王光正、林燕淑、高國峯、張瑞雲、彭正浩、黃鴻、Suttiwan Suwannajoi、許至乙、Damiana Simanjuntak、 Bui Dang Long、蘇家叡；郭文忠、Noya Yukari Siregar
摘要 Abstract of the paper	In an n-firm credence goods market where firms freely participate in certification by a third party, this research compares the quality standard and related welfare effects of the certification of NGOs (NC), the private institute (PC) and the public institute (GC). The findings show that certification leads firms to fall into a so-called certification trap, in which they are worse off than there is no certification. The novel result is that, if certification is costly, then partial participating equilibrium arises, NC and PC may set the same quality standard, which is less than that in GC; and then may raise the quality standard as the output market becomes more competitive. Furthermore, due to a less serious hurt on the participants by the certification trap and having an extra certification rent, PC may have higher social welfare than GC. The results in this study are more general than those in the previous literature.