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Screening instruments for monitoring market power: The return on withholding capacity index (RWC)

Marc Bataille, Olivia Bodnar, Alexander Steinmetz and Susanne Thorwarth

No 311, DICE Discussion Papers from University of Düsseldorf, Düsseldorf Institute for Competition Economics (DICE)

Abstract: While markets have been liberalized all over the world, incumbents often still hold a dominant position, e.g. on energy markets. Thus, wholesale electricity markets are subject to market surveillance. Nevertheless, consolidated findings on abusive practices of market power and their cause and effect in these markets are scarce and non-controversial market monitoring practices fail to exist. Right now, the Residual Supply Index (RSI) is the most important instrument for market monitoring. However, a major drawback of this index is its focus on just one specific aspect of market power in wholesale electricity markets whereas different consequences of market power are possible. Hence, markets could be distorted in several ways and we propose the 'Return on Withholding Capacity Index' (RWC) as a complementary index to the RSI. The index is a measure of the firms' incentive to withhold capacity. The benefits and practicability of the RWC is shown by an application on data for the German-Austrian electricity wholesale market in 2016.

Keywords: Market Power; Electric Power Markets; Residual Supply Index (search for similar items in EconPapers)
JEL-codes: L11 L43 L94 K23 C13 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-ene, nep-ind, nep-law and nep-reg
Date: 2019
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