Noisy Directional Learning and the Logit Equilibrium

We specify a dynamic model in which agents adjust their decisions toward higher payoffs, subject to normal error. This process generates a probability distribution of players’ decisions that evolves over time according to the Fokker–Planck equation. The dynamic process is stable for all potential games, a class of payoff structures that includes several widely studied games. In equilibrium, the distributions that determine expected payoffs correspond to the distributions that arise from the logit function applied to those expected payoffs. This “logit equilibrium” forms a stochastic generalization of the Nash equilibrium and provides a possible explanation of anomalous laboratory data.     

Minimum-Effort Coordination Games: Stochastic Potential and Logit Equilibrium

This paper revisits the minimum-effort coordination game with a continuum of Pareto-ranked Nash equilibria. Noise is introduced via a logit probabilistic choice function. The resulting logit equilibrium distribution of decisions is unique and maximizes a stochastic potential function. In the limit as the noise vanishes, the distribution converges to an outcome that is analogous to the risk-dominant outcome for 2 × 2 games. In accordance with experimental evidence, logit equilibrium efforts decrease with increases in effort costs and the number of players, even though these parameters do not affect the Nash equilibria. Journal of Economic Literature Classification Numbers: C72, C92.     

What is an ‘endogenous state space’?

Summary. In the literature on choice under unforeseen contingencies, the decision maker behaves as if she aggregates possible instances of future rankings indexed by a set S. The set S is interpreted as a subjective state space even though subsequent rankings need not conform to any one of the aggregated utilities. This paper proposes a definition for a subjective state space under unforeseen contingencies that is topologically unique, derives its existence from preference primitives as opposed to the representation of preferences, and does not commit to an interpretation in which states correspond to future realized rankings. The definition topologically concurs with and extends the identification of the essentially unique subjective state space due to Dekel, Lipman and Rustichini [4].Received: 28 October 2003, Revised: 13 October 2004, JEL Classification Numbers: D11, D81, D91.I thank Eddie Dekel, Alan Kraus, Bart Lipman, Chris Shannon, and the referee for some helpful remarks.     

Who consults investment analysts?

This paper shows that the questions: Who consults investment analysts? and Who goes to the El Farol bar in Santa Fe? are similar. Thus, investors use a mixed optimal strategy. The demand for consulting services is also characterized.Received: 25 September 2002, Accepted: 26 May 2003, JEL Classification: D81, C70Jacob Paroush: The author is grateful to Yaw Nyarko, Yigal Milchtaich and an anonymous referee for helpful comments and suggestions.     

The influence of feedback and awareness of consequences on the development of corporate sustainability action over time

The current level of corporate sustainability is insufficient for overcoming pressing environmental and social issues. Research is therefore needed about processes that lead to increased corporate action that fosters sustainable development. This study investigates the influence of feedback and corporate awareness of consequences on the development of corporate sustainability action over time. It uses action regulation theory to quantitatively analyse data of 59 large German companies measured at two points in time. The results reveal a positive temporal development of corporate sustainability action, and awareness of consequences positively mediates the relationship between corporate sustainability actions in two different time periods. Feedback acts as a moderator between the positive effect of corporate sustainability action in the first period on corporate awareness of consequences in the second period. Based on these findings, recommendations for organisations include the importance of seeking and processing feedback.     

An Institutional Theory Approach to the Evolution of the Corporate Social Performance – Corporate Financial Performance Relationship

In the present study, we integrate research from the dynamic institutional theory literature to develop a set of theory-driven hypotheses regarding how the institutionalization of corporate social performance (CSP) in the organizational field over the period 1991–2008 impacts the CSP- corporate financial performance (CFP) relationship for firms in the marketplace. The results of our panel time series and dynamic linear estimation models suggest that early CSP adopters are more likely to experience both greater firm profitability and increased stock market valuation as a result of their higher CSP levels. However, they also tend to incur more firm-idiosyncratic risk for being ahead of the market’s CSP expectations. We also demonstrate that the significant rise in CSP adoption and activities over time, as CSP has become institutionalized, has resulted in CSP becoming a weaker driver of both firm profitability and stock market valuation.     

Reporting of Internal Control Weaknesses and Debt Rating Changes

This article examines the effect of corporate reporting of internal control weaknesses on debt rating changes. Bond rating agencies utilize (among other factors) financial statement information to assess a firm’s liquidity and long term solvency as important inputs in determining corporate debt rating. Reporting of internal control weaknesses increases the reliability and transparency risk of the financial statement information, which may lead rating agencies to revise corporate default risk. Our results indicate that reporting of internal control weaknesses is significantly associated with debt ratings after controlling for other firm specific factors. Specifically, these findings suggest that reporting of internal control weaknesses can result in downgrades of the firm’s outstanding debt.