Market concentration ratios are popular statistics for characterizing the extent of market dominance in an imperfectly competitive market, but these ratios may not agree when comparing two markets. Neither do they necessarily agree with the Herfindahl-Hirschman or entropy indices. This letter compares two Cournot oligopoly markets in which firms have constant unit costs. It is shown that the ma...

This paper investigates the pricing of differentiated products in a vertical sector, with a focus on the role of industry concentration. We propose concentration indices that extend the classical Hirschman-Herfindahl Index (HHI) to include vertical structures that manage differentiated products. We also identify how substitution/complementarity among products affects pricing. We compare our pro...

The paper examines the impact of marketing segmentation practices on the performance of selected Nigerian commercial banks in the post consolidation era 2005 to date. Data employed were mainly secondary while the research design was exploratory in nature relating such basic variables as market segmentation practices of market share; pricing and geographical branch location to performance. Stati...

Market power refers to conditions where the providers of a service can consistently charge prices above those that would be established by a competitive market. There are many well known definitions of market power, including indices intended to quantify the degree of market concentration of energy supplies. This paper explores a method by which one of the standard indices in market power analy...

This paper promotes the idea of a culturally-sensitive Tiebout–Hirschman–Rothschild mechanism underpinning UK's 2016 Brexit result. Our culture-based development (CBD) model asserts trade-off between two rival types voting: voting with one's feet or in radical way due to being unable vote feet, akin protest vote. We explore effects on shares public spending culture and particular type migration...

One step in the curation process is geneId finding— the task of finding the database identifier of every gene discussed in an article. GeneId-finding was studied experimentally in the BioCreatIvE challenge (Hirschman et al., 2005), which developed testbed problems for each of three model organisms (yeast, mice, and fruitflies). Here we consider geneId ranking, a relaxation of geneId-finding in ...

We study the limiting eigenvalue distribution of n×n banded Toeplitz matrices as n → ∞. From classical results of Schmidt-Spitzer and Hirschman it is known that the eigenvalues accumulate on a special curve in the complex plane and the normalized eigenvalue counting measure converges weakly to a measure on this curve as n → ∞. In this paper, we characterize the limiting measure in terms of an e...