Clinton's Healthcare Reform
نویسندگان
چکیده
This paper explores environments in which either the revelation or diffusion of information, or its incorporation into stock prices, is gradual, and develops appropriate estimation techniques. This paper has implications both for event study methodology and for understanding the process by which stock prices incorporate information. Two environments are highlighted. First, information is often not revealed in one announcement but rather through a process of gradual public revelation, which may not be completely observable by a researcher. We examine the effect of the evolution of the Clinton health care reform proposal on pharmaceutical stock prices. We estimate the expected path of market-adjusted pharmaceutical prices over September 1992October 1993 by isotonic regression, and find that the major portion of the decline in stock prices occurred gradually, and did not correspond to identified news events. Second, the trading process itself may incorporate private information into stock prices gradually. That is an implication of the Kyle (1985) model, in which one or a small number of informed traders use their market power over their private information to maximize profits dynamically. We use the functional form predictions from Kyle in our estimation, and the results from a sample of targets of tender offers are consistent with the model. Sara Fisher Ellison Wallace P. Mullin Department of Economics Department of Economics Massachusetts Institute of Technology Michigan State University E52-274A East Lansing, MI 48824-1038 Cambridge, MA 02 1 39 and NBER [email protected] [email protected]
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