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Measuring multi-product banks' market power using the Lerner index

机译:使用Lerner Index测量多产品银行的市场权力

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The aggregate Lerner index is a popular composite measure of multi-product banks' market power, based on total assets as the single aggregate output factor. We show that the aggregate Lerner index only qualifies as a consistently aggregated Lerner index if three conditions hold. Under these conditions, the aggregate Lerner index reduces to a weighted-average of the product-specific Lerner indices. We test the three conditions for a sample of U.S. banks covering the years 2011-2017. All three conditions are rejected and we show that they may cause an economically relevant bias to the aggregate Lerner index, depending on the economic context. As a general solution, we propose using the always consistently aggregated weighted-average Lerner index whenever a composite Lerner index is needed. (C) 2020 The Author(s). Published by Elsevier B.V.
机译:基于单骨总输出因子的总资产,聚合Lerner指数是多产品银行市场电力的流行综合措施。我们表明,如果三个条件保持,聚合Lerner索引仅符合始终聚合的Lerner索引。在这些条件下,聚合液位索引减少到产品特定的Lerner指标的加权平均值。我们测试2011-2017年的美国银行样本的三个条件。所有三种条件都被拒绝,我们表明,根据经济背景,他们可能会对聚集液位指数造成经济相关的偏差。作为一般解决方案,我们建议每当需要复合列机索引时始终始终综合的加权平均延志索引。 (c)2020提交人。由elsevier b.v出版。

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