Price Discrimination in Practice: The Market for Drugs in Egypt and the U.S.

This paper attempts to analyze the medical and economical reasons that cause a difference in the price elasticity of patients' demand to drugs between Egypt and the United States of America. The study was based on two medicines produced by Pfizer (Lipitor and Viagra), with both of them available in Egypt as well as the United States. The result of this study reflected that Egyptians are more sensitive to the changes in price relative to Americans for both Lipitor and Viagra because of different economical and medical factors.Price Discrimination, Pharmaceutical Industry

Localization Transition in Incommensurate non-Hermitian Systems

A class of one-dimensional lattice models with incommensurate complex potential $V(\theta)=2[\lambda_r cos(\theta)+i \lambda_i sin(\theta)]$ is found to exhibit localization transition at $|\lambda_r|+|\lambda_i|=1$. This transition from extended to localized states manifests in the behavior of the complex eigenspectum. In the extended phase, states with real eigenenergies have finite measure and this measure goes to zero in the localized phase. Furthermore, all extended states exhibit real spectrum provided $|\lambda_r| \ge |\lambda_i|$. Another novel feature of the system is the fact that the imaginary part of the spectrum is sensitive to the boundary conditions {\it only at the onset to localization}

The relationship between inequality and GDP growth: An empirical approach

The aim of this work is to analyze the relationship between inequality and economic growth. The results obtained by previous empirical papers were mixed. Authors such as Persson and Tabellini (1991) or Alesina and Rodrik (1994), in fact, find evidence of a negative relationship between the two variables of interest; on the contrary, Li and Zou (1998) and Forbes (2000) find that greater inequality is associated with faster economic growth. Barro (2000 and 2008) claims that inequality has a positive effect on GDP growth in advanced economies, but has a negative impact in developing ones. The present work considers two samples of OCSE countries; in the full sample 33 countries are analyzed for the 1971-2010 period and inequality data are taken from the UNU-WIDER dataset. In the restricted sample 27 countries are considered for the 1981-2010 period and inequality data from the Luxembourg Income Study are used. The estimation technique employed are fixed effects, random effects and GMM Arellano-Bond. The Gini coefficient has been used as inequality measure and ten-years averages of the data have been computed in order to reduce the problem linked to the limited variability of the Gini coefficient across time. In the case of the fixed effects and the GMM estimates on the full sample, positive and statistically significant estimated coefficients for the inequality measure are obtained. The value ranges from 1.2 to 1.5; this means that a 1% increase in inequality within a country would be followed by a more than proportional increase in the rate of economic growth in the following ten years. All the other estimated coefficients, when statistically significant, take the expected sign and the Sargan test confirms that the over-identifying restriction used for the GMM estimation are valid. However, there is room for further research, in particular by considering that: the relationship between the two variables of interest may be quadratic and not linear, the time horizon considered may significatively influence the estimation results and finally it would be necessary to extend the sample by also including developing countries (non-OCSE members)

Effects of territorial intrusions on eavesdropping neighbors: communication networks in nightingales

Animal communication often occurs in communication networks in which multiple signalers and receivers are within signaling range of each other. In such networks, individuals can obtain information on the quality and motivation of territorial neighbors by eavesdropping on their signaling interactions. In songbirds, extracting information from interactions involving neighbors is thought to be an important factor in the evolution of strategies of territory defense. In a playback experiment with radio-tagged nightingales Luscinia megarhynchos we here demonstrate that territorial males use their familiar neighbors' performance in a vocal interaction with an unfamiliar intruder as a standard for their own response. Males were attracted by a vocal interaction between their neighbor and a simulated stranger and intruded into the neighbor's territory. The more intensely the neighbor had interacted with playback, the earlier the intrusions were made, indicating that males eavesdropped on the vocal contest involving a neighbor. However, males never intruded when we had simulated by a second playback that the intruder had retreated and sang outside the neighbor's territory. These results suggest that territorial males use their neighbors' singing behavior as an early warning system when territorial integrity is threatened. Simultaneous responses by neighboring males towards unfamiliar rivals are likely to be beneficial to the individuals in maintaining territorial integrit