The Effect of Corporate Merger Transactions on the Information Content of Earnings Announcements*

Abstract. This study develops and tests the proposition that corporate merger transactions give rise to changes in the association between firm accounting earnings and security returns. A model of the effect of merger transactions on stock price responses to information releases suggests that the earnings response coefficient of a postmerger entity is a weighted average of the earnings response coefficients of the combining firms, with the weights depending on relative earnings variability of the combining firms. Empirical results, based on a sample of 90 mergers completed over a 12-year period, are consistent with the model. Résumé. L'auteur élabore et vérifie une proposition selon laquelle les opérations de fusion donnent lieu à des changements dans la relation entre les bénéfices comptables de l'entreprise et le rendement de ses titres. Selon le modèle de l'incidence des opérations de fusion sur la réaction du cours des valeurs mobilières à la communication d'information, le coefficient de réaction des bénéfices d'une entité résultant d'une fusion est la moyenne pondérée des coefficients de réaction des bénéfices des entreprises qui fusionnent, les pondérations dépendant de la variabilité relative des bénéfices des entreprises constituantes. Les résultats empiriques, fondés sur un échantillon de 90 fusions s'échelonnant sur une période de plus de 12 ans, confirment la validité du modèle.     

CAUSALITY IN POLITICAL BUSINESS CYCLES

One can easily identify four general models of political business cycles: office-motivated models (both forward and backward looking) and partisan models (again, both forward and backward looking). Each model makes different assumptions about the direction and timing of causal links between the economy and polity. This paper uses Granger causality tests to investigate the causal links between presidential popularity and different measures of aggregate economic performance and aggregate economic policy. The paper's aim is to investigate whether any existing theories receive substantive support and, if not, to suggest the properties that any new theories should display. The results indicate no overwhelming support for any existing theories, though partisan models receive more support than do office-motivated models. The data appear to be most consistent with Ellis and Thoma's reputational partisan model.     

Endogenous Group Formation

While the rules governing the formation of groups engaging in collective action may have significant impact on group size and behavior of members, most experiments on public goods have been conducted with the subjects in exogenously fixed groups or of fixed sizes. We study endogenous formation of groups in a public‐goods provision game by allowing subjects to change groups under three sets of rules: free entry/exit, restricted entry with free exit, and free entry with restricted exit. We find that the rules governing entry and exit do have a significant impact on individual behavior and group‐level outcomes.     

Social Discount Rates from Stratospheric Ozone Control*

We develop a model of optimal project timing to infer the discount rate US residents attach to investments in stratospheric ozone preservation. In this model, the calendar date at which preservation-related benefits offset costs is shown to be an increasing function of the real social rate of time preference. Estimates of US costs and benefits associated with the original (1987) Montreal Protocol are used to determine a range of discount rates from the US control of stratospheric ozone depletion. From this example the range is about 3.0 to 8.77 per cent.