This article empirically analyzes some properties shared by all one-dimensional diffusion option models. Using S&P 500 options, we find that sampled intraday (or interday) call (put) prices often go down (up) even as the underlying price goes up, and call and put prices often increase, or decrease, together. Our results are valid after controlling for time decay and market microstructure effects. Therefore one-dimensional diffusion option models cannot be completely consistent with observed option price dynamics; options are not redundant securities, nor ideal hedging instruments-puts and the underlying asset prices may go down together.

Kevin C. W. Chen, Michael P. Schoderbek, The 1993 Tax Rate Increase and Deferred Tax Adjustments: A Test of Functional Fixation, Journal of Accounting Research, Vol. 38, No. 1 (Spring, 2000), pp. 23-44

This study investigates the valuation effect of modified audit opinions (MAOs) on the emerging Chinese stock market. Here, the term MAO refers to both qualified opinions and unqualified opinions with explanatory notes. The latter can be considered an alternative form of a qualified opinion in China. The institutional setting in China enables us to find compelling evidence in support of the monitoring role of independent auditing as an institution. First, we find a significantly negative association between MAOs and cumulative abnormal returns after controlling for effects of other concurrent announcements. Further, results from a by‐year analysis suggest that investors did not reach negative consensus about MAOs' valuation effect until the second year, exhibiting the learning process of a market without prior exposure to MAOs. Second, we do not observe significant differences between market reaction to non‐GAAP‐ and GAAP‐violation‐related MAOs. Third, no significant difference is found between market reaction to qualified opinions and market reaction to unqualified opinions with explanatory notes.

This study investigates the valuation effect of modified audit opinions (MAOs) on the emerging Chinese stock market. Here, the term MAO refers to both qualified opinions and unqualified opinions with explanatory notes. The latter can be considered an alternative form of a qualified opinion in China. The institutional setting in China enables us to find compelling evidence in support of the monitoring role of independent auditing as an institution. First, we find a significantly negative association between MAOs and cumulative abnormal returns after controlling for effects of other concurrent announcements. Further, results from a by-year analysis suggest that investors did not reach negative consensus about MAOs' valuation effect until the second year, exhibiting the learning process of a market without prior exposure to MAOs. Second, we do not observe significant differences between market reaction to non-GAAP- and GAAP-violation-related MAOs. Third, no significant difference is found between market reaction to qualified opinions and market reaction to unqualified opinions with explanatory notes.

Hsiu-Lang Chen, Narasimhan Jegadeesh, Russ Wermers, The Value of Active Mutual Fund Management: An Examination of the Stockholdings and Trades of Fund Managers, The Journal of Financial and Quantitative Analysis, Vol. 35, No. 3 (Sep., 2000), pp. 343-368

Selective versus Universal Vouchers: Modelling Median Voter Preferences in Education by Zhiqi Chen and Edwin G. West. Published in volume 90, issue 5, pages 1520-1534 of American Economic Review, December 2000

This article empirically analyzes some properties shared by all one-dimensional diffusion option models. Using S&P 500 options, we find that sampled intraday (or interday) call (put) prices often go down (up) even as the underlying price goes up, and call and put prices often increase, or decrease, together. Our results are valid after controlling for time decay and market microstructure effects. Therefore one-dimensional diffusion option models cannot be completely consistent with observed option price dynamics; options are not redundant securities, nor ideal hedging instruments—puts and the underlying asset prices may go down together.

This paper examines the role of investment opportunities and free cash flow in explaining the source of the wealth effect of international joint ventures. We document that firms with promising investment opportunities have significantly positive response to announcements of international joint venture investments, whereas firms with poor investment opportunities have unfavorable response to such announcements. In contrast, we find that free cash flow does not explain the cross-sectional differences in abnormal returns associated with the announcements of international joint ventures. Thus, our results show support for the investment opportunities hypothesis but no support for the free cash flow hypothesis. These findings hold even after controlling for other potential explanatory variables.

Gross spreads received by underwriters on initial public offerings (IPOs) in the United States are much higher than in other countries. Furthermore, in recent years more than 90 percent of deals raising $20–80 million have spreads of exactly seven percent, three times the proportion of a decade earlier. Investment bankers readily admit that the IPO business is very profitable, and that they avoid competing on fees because they ‘don't want to turn it into a commodity business.’ We examine several features of the IPO underwriting business that result in a market structure where spreads are high.