\ifx\undefined\BySame
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\begin{thebibliography}{}

\harvarditem[Bikhchandani, Hirshleifer, and Welch]{Bikhchandani, Hirshleifer,
  and Welch}{1992}{bhw:1992}
\textmd{Bikhchandani, S., D.~Hirshleifer,  \textmd{and} I.~Welch}, 1992,  ``A
  Theory of Fads, Fashion, Custom, and Cultural Change as Informational
  Cascades,'' \emph{Journal of Political Economy}, 100(5), 992--1026.

\harvarditem[Welch]{Welch}{2002}{welch:2002}
\textmd{Welch, I.}, 2002,  ``The Top Achievements, Challenges, and Failures of
  Finance,'' working paper, Yale SOM.

\harvarditem[Welch]{Welch}{2003}{welch:2003}
\textmd{\BySame{}}, 2003,  \emph{A First Course in Finance}. IAW Press, New
  Haven, CT.

\end{thebibliography}