Bowblis John R, North Phillip
Department of Economics, Farmer School of Business, Miami University, Oxford, OH 45056, USA.
Inquiry. 2011 Summer;48(2):138-54. doi: 10.5034/inquiryjrnl_48.02.03.
Correct geographic market definition is important to study the impact of competition. In the nursing home industry, most studies use geopolitical boundaries to define markets. This paper uses the Minimum Data Set to generate an alternative market definition based on patient flows for Medicare skilled nursing facilities. These distances are regressed against a range of nursing home and area characteristics to determine what influences market size. We compared Herfindahl-Hirschman Indices based on county and resident-flow measures of geographic market definition. Evidence from this comparison suggests that using the county for the market definition is not appropriate across all states.
正确的地理市场定义对于研究竞争影响至关重要。在养老院行业，大多数研究使用地缘政治边界来定义市场。本文使用最小数据集，基于医疗保险专业护理机构的患者流动情况生成另一种市场定义。将这些距离与一系列养老院和地区特征进行回归分析，以确定哪些因素会影响市场规模。我们比较了基于县和居民流动量的地理市场定义的赫芬达尔-赫希曼指数。这种比较的证据表明，在所有州都使用县来定义市场并不合适。
