A New Axiomatization of the Banzhaf Index for Games with Abstention

(3, 2)-Simple games are a model for voting situation in which players can vote not only in favour or against a proposal but they can also abstain. Also in this model, power indices are used to evaluate the power of players. In particular, the Banzhaf index and the Shapley–Shubik index have been generalized to define analogous power indices in the context of games with abstention. In this work we provide a new axiomatization of the Banzhaf index for games with abstention, to underline its properties and increase the justification of the use of this index as a solution concept also in the family of games with abstention.     

Possibilistic mean–variance portfolios versus probabilistic ones: the winner is...

Decisions in Economics and Finance - In this paper, we compare the mean–variance portfolio modeling based on the possibilistic representation of the future stock returns to the one based on...     

When legacy carriers converge with low-cost carriers: Exploring the fusion of European airline business models through a case-based analysis

The paper makes uses of cognitive mappings developed from personal interviews with a number of European airline executives to examine the differences in managerial attitudes of low-cost and transitional carriers. In particular it explores the extent to which there is a convergence of views regarding the ways various airline models will develop in the future.     

A tale of two Italian cities: brand-level milk demand and price competition

We apply the BLP random coefficient logit model demand model to fluid milk sales data from two north-south Italian cities: Turin and Naples. By virtue of their location and socioeconomic differences, these cities provide a natural experiment for contrasting consumer choices and retail market power related to milk physical and marketing characteristics. Results reveal that, regardless of location, consumers negatively value price increases, fat content and ultra-high temperature (UHT) treatment. However, location matters with respect to brand and type of milk purchased. While in Turin (the higher-income region) demand for the leading manufacturers’ brands is the most price inelastic, in Naples consumers have the lowest price elasticities in case of cheaper milk, often small manufacturer or private label brands. Unlike previous studies, we do not find price elasticities for private labels to be consistently lower (or markups to be higher) compared to manufacturer brands, indicating that private labels have reached maturity in these markets. Further, while demand for fresh milk is more price inelastic in Turin, it is more inelastic for UHT milk in Naples. Likewise, markups and Lerner indexes are higher for fresh milk in Turin and for UHT in Naples corresponding to the more inelastic demands under Bertrand price competition.     

A round of dancing and then one more: embedding intuition in the ballet of entrepreneurial decision making

The dance metaphor allows us to figuratively depict entrepreneurial decision making processes. Being conventionally conceived of as a sequence of purposeful behaviors rooted in a rational cognition process, entrepreneurial decision making can be featured as a ‘ballet’. This interpretation puts in the background the improvisational nature of decision making, which revokes ‘lindy hop’ as a dance style. The article intends to illuminate the role of intuition, highlighting its overlap with rationality in the entrepreneurial decision making dance. For this purpose, a bibliometric analysis followed by an interpretive literature review advances a comprehensive report of 66 peer-reviewed journal articles published from 1995 to 2019, constructing evidence on the nature of entrepreneurial decision making and on the interplay between intuition and rationality. Literature is categorized in five clusters, which are reciprocally intertwined. Firstly, intuition is unconsciously used as a strategy to deal with the uncertainty that inherently affects entrepreneurial ventures. Secondly, intuition is rooted in the entrepreneurs’ impulsivity, that echoes the role of emotions in decision making. Thirdly, the merge of rationality and intuition improves the entrepreneurs’ ability to keep up with the erratic rhythm of the decision making dance. Fourthly, the mix of intuition and rationality serves as a catalyst of entrepreneurs’ ability to thrive in complex and unpredictable environments. Fifthly, intuition generates drawbacks on entrepreneurs’ meta-cognitive knowledge, which should be carefully recognized. Embracing the dance metaphor, intuition turns out to be crucial to make entrepreneurs able to fill in the gap between rationality and uncertainty.

     

Asymptotic results for the Fourier estimator of the integrated quarticity

Decisions in Economics and Finance - In this paper, we prove a central limit theorem for an estimator of the integrated quarticity based on Fourier analysis, strictly related to the one proposed in...     

Kyle equilibrium under random price pressure

Decisions in Economics and Finance - We study the equilibrium in the model proposed by Kyle (Econometrica 53(6):1315–1335, 1985) and extended to the continuous-time setting by Back (Rev...     

Mutual funds relationships and performance analysis

The present paper aims at exploring the equity exposure of Italian equity mutual funds as they emerge from their portfolio holdings at the date of December 31st, 2010. The technique adopted in the analysis considers the construction of a bipartite network and the detection of the overlap of portfolios held by mutual funds. The relationship among stocks due to their presence in the same portfolios is analyzed, too. Methods typical of complex networks are then applied. The comparison with several performance measures allows to discuss features of active/passive style management for institutional portfolios.