Wenlan Qian

National University of Singapore
Business School
Department of Finance

E-Mail: wenlan.qian@nus.edu.sg
Institutional Affiliation: National University of Singapore

NBER Working Papers and Publications

January 2014How Constraining Are Limits to Arbitrage? Evidence from a Recent Financial Innovation
with Alexander Ljungqvist: w19834
Limits to arbitrage play a central role in behavioral finance. They are thought to interfere with arbitrage processes so that security prices can deviate from true values for extended periods of time. We describe a recent financial innovation that allows limits to arbitrage to be sidestepped, and overvaluation thereby to be corrected, even in settings characterized by extreme costs of information discovery and severe short-sale constraints. We report evidence of shallow-pocketed "arbitrageurs" expending considerable resources to identify overvalued companies and profitably correcting overpricing. The innovation that allows the arbitrageurs to sidestep limits to arbitrage involves credibly revealing their information to the market, in an effort to induce long investors to sell so that price...
September 2013Speculative Investors and Tobin's Tax in the Housing Market
with Yuming Fu, Bernard Yeung: w19400
This paper examines the impact of a policy change in Tobin's tax on housing market speculators. The policy intervention effectively raised the transaction cost in the market segment with a high presence of speculators. Relative to the unaffected control sample, we find that the rise in transaction cost substantially reduced speculative trading activities in the treatment sample. However, it significantly raised its price volatility and reduced the price informativeness. We further show that the unintended consequences are likely due to a relatively greater withdrawal by informed speculators than by destabilizing speculators after the transaction cost increase.

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