"Biodiversity prospecting" has been touted as a mechanism for both discovering new pharmaceutical products and saving endangered ecosystems. It is unclear what values may arise from such activities, however. Evidence from transactions is incomplete and existing theoretical models are flawed. We calculate an upper bound on the value of the "marginal species." Even under favorable assumptions this bound is modest. Slightly modified assumptions lead to drastically lower estimates. We extend our findings to the value of the marginal hectare of habitat and find that the incentives for habitat conservation generated by private pharmaceutical research are also, at best, very modest.

ABSTRACT The use of predetermined variables to represent public information and time‐variation has produced new insights about asset pricing models, but the literature on mutual fund performance has not exploited these insights. This paper advocates conditional performance evaluation in which the relevant expectations are conditioned on public information variables. We modify several classical performance measures to this end and find that the predetermined variables are both statistically and economically significant. Conditioning on public information controls for biases in traditional market timing models and makes the average performance of the mutual funds in our sample look better.

Willingness to pay (WTP), most economists believe, is an appropriate benefits metric for government expenditure and regulatory policies that reduce risks to human life. It depends, however, on the distribution of risk and wealth. Currently, society's expenditures overemphasize concentrated risks, say after-the-fact treatment as opposed to prevention. A "dead-anyway" effect complements excess attention to intense interests in explaining this. Our normative criterion for spending on risk reduction is what a rational, albeit uninsured, individual confronting lotteries on future risks to life and wealth would choose for himself. This requires correcting WTP to eliminate the dead-anyway effect but continues to reflect that wealth enhances the utility of living.

Bernard Dumas and Blaise A1laz exemplifies the objective of the series.Dumas and A1laz present a thorough and complete exposition of three important areas of modern finance: portfolio theory and asset pricing, option pricing, and fixed income valuation.

Abstract This study investigates the association between going concern opinions and the market's reaction to bankruptcy filings. The results of prior studies indicate that going concern opinions are useful in predicting bankruptcy and provide some explanatory power in predicting bankruptcy resolution. As such, going concern opinions may reduce the surprise associated with bankruptcy. Our results are consistent with this assertion. Firms receiving going concern opinions experience less negative excess returns in the period surrounding bankruptcy filings than those receiving unqualified opinions. These results hold after controlling for the probability of bankruptcy, the market's reaction to news announcements occurring prior to bankruptcy, and changes in stock price prior to the issuance of the auditor's report. Overall, our results are consistent with going concern opinions having information value.

ABSTRACT We test the hypothesis that when their compensation is linked to relative performance, managers of investment portfolios likely to end up as “losers” will manipulate fund risk differently than those managing portfolios likely to be “winners.” An empirical investigation of the performance of 334 growth‐oriented mutual funds during 1976 to 1991 demonstrates that mid‐year losers tend to increase fund volatility in the latter part of an annual assessment period to a greater extent than mid‐year winners. Furthermore, we show that this effect became stronger as industry growth and investor awareness of fund performance increased over time.

We test the hypothesis that when their compensation is linked to relative performance, managers of investment portfolios likely to end up as will manipulate fund risk differently than those managing portfolios likely to be An empirical investigation of the performance of 334 growth-oriented mutual funds during 1976 to 1991 demonstrates that mid-year losers tend to increase fund volatility in the latter part of an annual assessment period to a greater extent than mid-year winners. Further, we show that this effect became stronger as industry growth and investor awareness of fund performance increased over time.

"Biodiversity prospecting" has been touted as a mechanism for both discovering new pharmaceutical products and saving endangered ecosystems. It is unclear what values may arise from such activities, however. Evidence from transactions is incomplete and existing theoretical models are flawed. We calculate an upper bound on the value of the "marginal species." Even under favorable assumptions this bound is modest. Slightly modified assumptions lead to drastically lower estimates. We extend our findings to the value of the marginal hectare of habitat and find that the incentives for habitat conservation generated by private pharmaceutical research are also, at best, very modest.