Jianping Mei

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P.R. China
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NBER Working Papers and Publications

May 2005Speculative Trading and Stock Prices: Evidence from Chinese A-B Share Premia
with Jose Scheinkman, Wei Xiong: w11362
The market dynamics of technology stocks in the late nineties has stimulated a growing body of theories that analyze the joint effects of short-sales constraints and heterogeneous beliefs on stock prices and trading volume. This paper examines implications of these theories using a unique data sample from China, a market with stringent short-sales constraints and perfectly segmented dual-class shares. The identical rights of the dual-class shares allow us to control for stock fundamentals. We find that trading caused by investors' speculative motive can help explain a significant fraction of the price difference between the dual-class shares.

Published: Jianping Mei & Jose A. Scheinkman & Wei Xiong, 2009. "Speculative Trading and Stock Prices: Evidence from Chinese A-B Share Premia," Annals of Economics and Finance, Society for AEF, vol. 10(2), pages 225-255, November. citation courtesy of

April 2003Idiosyncratic Risk and the Creative Destruction in Japan
with Yasushi Hamao, Yexiao Xu: w9642
The dramatic rise and fall of the Japanese equity market provides a unique opportunity to examine market-and firm-specific risks over different market conditions. The price behavior of Japanese equities in the 1990s is found to resemble that of U.S. equities during the Great Depression. Both show increasing market volatility and a prolonged large co-movement in equity prices. What is unique about the Japanese case is the surprising fall in firm-level volatility and turnover in Japanese stocks after its market crash in 1990. This large decrease in firm-level volatility may have impeded Japan's capital formation process as it has become more difficult over the past decade for both investors and managers to separate high quality from low quality firms. Using data on firm performance fundament...
April 1993Where do Betas Come From? Asset Price Dynamics and the Sources of Systematic Risk
with John Campbell: w4329
This paper breaks assets' betas with common factors into components attributable to news about future cash flows, real interest rates, and excess returns. To achieve this decomposition the paper uses a vector autoregressive time-series model and an approximate log-linear present value relation. The betas of industry and size portfolios with the market are largely attributed to changing expected returns. Betas with inflation and industrial production reflect opposing cash flow and expected return effects. The paper also shows how asset pricing theory restricts the expected excess return components of betas.

Published: Review of Financial Studies. vol 6, no. 3, 1993, p. 567-592

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