NBER Publications by Jianfeng Shen

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Working Papers and Chapters

November 2012Building Castles in the Air: Evidence from Industry IPO Waves
with Zhi Da, Ravi Jagannathan: w18555
We provide empirical support for the conventional wisdom that there are times when optimistic investors tend to build their hopes into castles in the air, and pay a large premium over intrinsic value for stocks of firms in the early stages of their life cycles with perceived growth opportunities. We use industry IPO waves containing a set of firms in the same industry that went public at about the same time in a cluster to identify those time periods and firms that are relatively homogenous and in the same early growth stages of their life cycles. We find that three years after an industry IPO wave ends, among the firms in the wave with relatively high historical sales growth rates, those with low gross margins are over-valued relative to firms with high gross margins. They under-perform t...
March 2010Information, analysts, and stock return comovement
with Allaudeen Hameed, Randall Morck, Bernard Yeung: w15833
We examine information spillover as a source of stock return synchronicity, where information about highly-followed “prominent” stocks is used to price other “neglected” stocks sharing a common fundamental component. We find that stocks followed by few analysts co-move significantly with firm-specific fluctuations in the prices of highly followed stocks in the same industry, but do not observe the converse. This effect is more prominent in industries where analysts follow fewer stocks. Earnings forecast revisions for highly followed stocks cause price changes in little followed stocks, but the converse is again not observed. This is consistent with information spillover being primarily unidirectional – flowing from prominent to neglect stocks, but not vice versa. These findings also valida...

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