The available research literature on stock performance has primarily stressed the importance of asset price theories, macroeconomic and microeconomic, institutional differences. However, there is still an open question: Are any other factors those influence performance? This aims to answer this question by providing new insights into industry along with country-level firm-specific in conjunctio...

Studies on the structure of economic systems are, most frequently, carried out by the methods of informational statistics. These methods, often accompanied by a broad range of indicators (Shannon entropy, Balassa coefficient, Herfindahl specialty index, Gini coefficient, Theil index, etc.) around which a wide literature has been created over time, have a major disadvantage. Their weakness is re...

BACKGROUND Markets for physician services are becoming increasingly concentrated, with many areas being dominated by a few groups. Antitrust authorities are concerned that increasing concentration will lead to inappropriately high payments for physician services from private insurers. The authors examined the association between market concentration and private insurer payments for anesthesia s...

Recent increases in market concentration among health plans, hospitals, and medical groups raise questions about what impact such mergers are having on costs to consumers. We examined the impact of market concentration on the growth of health insurance premiums between 2014 and 2015 in two Affordable Care Act state-based Marketplaces: Covered California and NY State of Health. We measured healt...

OBJECTIVES To examine the effects of market competition on patient-perceived quality of care under a single-payer system in Taiwan. METHODS Data came from two nationwide surveys conducted on discharged patients and National Health Insurance (NHI) hospital claim datasets in 2002 and 2004. Competition was measured by the Herfindahl-Hirschman Index (HHI). Quality of care was measured by patient-...

OBJECTIVE To analyze the impact of hospital mergers on treatment intensity and health outcomes. DATA Hospital inpatient data from California for 1990 through 2006, encompassing 40 mergers. STUDY DESIGN I used a geographic-based IV approach to determine the effect of a zip code's exposure to a merger. The merged facility's market share represents exposure, instrumented with combined premerge...

We present some evidence from the U.S. Census about the market concentration in the home appliances sector (e.g., four-firm concentration ratio and Herfindahl-Hirshman index) which suggests that competition in this sector, rather than being perfect, is better described by an oligopoly structure. We develop a general equilibrium three-sector growth model (home, market, appliances) where the pric...

Using prices of hospital admissions and visits to five types of physicians, we analyzed how provider and insurer market concentration-as measured by the Herfindahl-Hirschman Index (HHI)-interact and are correlated with prices. We found evidence that in the range of the Department of Justice's and Federal Trade Commission's definition of a moderately concentrated market (HHI of 1,500-2,500), ins...

This article focuses on the transition of international monetary system to a multipolar structure. The continuously evolves, reflecting developments in world economy. main problem current is its dependence one key currency which still remains US dollar. authors this study address issue towards by examining concentration. primary objective work establish whether or not shows signs transitioning ...