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Do call auctions curtail price volatility? Evidence from the National Stock Exchange of India

Silvio John Camilleri (Department of Banking and Finance – FEMA, University of Malta, Msida, Malta)

Managerial Finance

ISSN: 0307-4358

Article publication date: 12 January 2015

Abstract

Purpose

The purpose of this paper is to empirically investigate whether call auctions which batch orders for simultaneous execution, may restrain stock market volatility.

Design/methodology/approach

The authors use high-frequency data to investigate volatility changes following the suspension of opening and closing call auctions on the National Stock Exchange (NSE) of India in 1999. The authors evaluate this issue by considering both modelled and realised volatility. Using a GARCH approach the authors model intra-day volatility for the trading days preceding and succeeding the auction suspension. The authors also scrutinise return distributions to look for volatility changes during different parts of the day.

Findings

When interpreted collectively, the empirical results suggest that the auction suspension was followed by reduced volatility particularly in the middle of the trading day and at the closing.

Practical implications

Given that auctions are often incorporated in trading systems with the aim of curtailing volatility, the main conclusion, that the auction suspension was followed by lower volatility, has important practical inferences. Auctions cannot be automatically relied on to reduce volatility. The intricacies of the auction protocol and their interaction with ancillary market microstructure features may impact on auction efficacy.

Originality/value

The paper adopts a novel approach towards assessing the effectiveness of auctions by considering an unusual occurrence of an auction suspension. The empirical setting enables a clear comparison of the respective regimes since these periods do not materially differ in other subsidiary aspects. This is a noteworthy factor, since the empirical contexts considered in prior studies, often feature several simultaneous changes.

Keywords

Acknowledgements

JEL Classification — G12, G18

This paper has significantly benefited from extensive discussions with Christopher J. Green (Loughborough University). The author also thanks Steve Thomas (Cass Business School), Lawrence Leger (Loughborough University) and participants at the International Conference on High Frequency Finance (2006) for fruitful comments, and the National Stock Exchange of India for providing the data.

Citation

Camilleri, S.J. (2015), "Do call auctions curtail price volatility? Evidence from the National Stock Exchange of India", Managerial Finance, Vol. 41 No. 1, pp. 67-79. https://doi.org/10.1108/MF-10-2013-0292

Publisher

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Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited