The Impact of Stock Market Structure on Volatility: Evidence from a Call Auction Suspension (original) (raw)
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Do call auctions curtail price volatility? Evidence from the National Stock Exchange of India
Managerial Finance, 2015
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 tr...
Emerging stock market microstructure: empirical studies of the National Stock Exchange of India
2006
This thesis adopts an empirical approach to examine various market microstructure issues, using data from the National Stock Exchange of India (NSE). Whilst the respective empirical analyses may be considered as self-contained investigations, they are primarily linked through the common objective of understanding the mechanics of the pricing process as it occurs on actual markets, using the NSE as exemplar. The first major focus of the dissertation is non-synchronous trading: empirical evidence of nonsynchronicity is obtained by testing for predictability as between indices of different levels of liquidity. A simple test of the analysis of trading-break returns is proposed to infer whether predictability may be mainly attributable to non-synchronous trading or whether it constitutes a delayed adjustment of traders' expectations. The second question tackled in the thesis is whether volatility on the NSE may be considered as justified or excessive. Rather than adopting the established methodology of comparing stock price changes to information about expected dividends, the research question is split up into two subsidiary ones. The first question is whether volatility is related to information flows, whilst the second related question concerns the relationship between volatility and returns. Three sources of excessive volatility are pinpointed. Monday effects are found in index data but not in the underlying stocksindicating index fluctuations which are not information-related. A second indicator of excessive price movements is the pronounced volatility which coincides with the fiscal year end of quoted companies but which is not accompanied by a similar increase in long-term returns. A third indication of unjustified price fluctuations is that volatility seems unrelated to returns when considering a long-term time series. The third topic of the thesis relates to the efficacy of opening and closing call auctions. This issue may be considered as the crux of the dissertation and it is tackled by analysing the effects of the suspension of a call auction system on NSE. Changes in volatility, efficiency and liquidity following the suspension are analysed, and an event study is presented. The relationship between call auctions and long-term volatility is also investigated. The findings suggest that the expected benefits of call auctions may not always materialise, possibly due to an inappropriately structured auction, or because a liquidity threshold for stocks must be surpassed for the expected benefits to accrue.
SSRN Electronic Journal, 2012
Call markets are claimed to aggregate information and facilitate price discovery where continuous markets may fail. The impact of the introduction of call auction has not been found uniformly beneficial, possibly due to poor design or due to 'thick market externalities'. This paper examines the reintroduction of opening call auction at the National Stock Exchange of India in 2010. The results suggest that the auctions attract very little volume, the intraday pattern of volume and volatility in the continuous market remains unchanged and a large fraction of price discovery, measured by the Weighted Price Contribution, still takes place in the first 15 min of continuous market. However, the market synchronicity has improved after the introduction of the auction. Our findings suggest that the ability to attract volume in the call auction for effective price discovery depends on the institutional settings and the characteristics of liquidity supply in the market.
Market microstructure effects on volatility at the TAIFEX
Journal of Futures Markets, 2007
This study examines whether changes in the frequency of market clearing or changes in trading hours on competing exchanges that use different auction systems affect the volatility of futures prices. In particular, this study exploits a natural experiment in the frequency of market clearing of stock index futures contracts traded on the Taiwan Futures Exchange (TAIFEX) to assess whether successive increases in the frequency of market clearing are associated with changes in the volatility of futures prices. The impact of changes in the trading hours on the TAIFEX and on the competing Singapore Exchange (SGX) where a similar Taiwanese stock index futures contract trades under a continuous auction market regime is The authors are grateful to the Securities Industry Research Centre of Asia-Pacific (SIRCA) for supplying the data. also examined. The evidence for the impact of an increase in the frequency of market clearing on volatility is mixed. However, the introduction of simultaneous opening times for the TAIFEX (which batches orders at the open) and the SGX (which does not) is associated with a significant reduction in the volatility in SGX Taiwanese stock index futures prices.
Measuring the effectiveness of volatility auctions
We propose a method for event studies based on synthetic portfolios that provides a robust data-driven approach to build a credible counterfactual. The method is used to evaluate the effectiveness of volatility auctions using intraday data from the Colombian Stock Exchange. The results indicate that the synthetic portfolio method provides an accurate way to build a credible counterfactual that approximates the behavior of the asset if the auction had not taken place. The main results indicate that the volatility auction mitigates the volatility of the asset, but its effect on liquidity and trading activity is ambiguous at best.
A call auction's impact on price formation and order routing: evidence from the NASDAQ stock market
Electronic call auctions are used globally to open and close equity market trading; as such, they are a critically important facility that needs to be better understood. The paper focuses on the impact NASDAQ's calls (introduced in 2004) have had on bid-ask spreads, price volatility, and order routing in the continuous market that follows daily openings and which precedes daily closings. NASDAQ's closing call has significantly reduced both spreads and volatility for all market capitalization groups. Its opening call similarly reduced spreads, while a generally similar, though somewhat weaker, pattern of volatility reduction was realized. Although the pattern of trading volume has, for the most part, not been significantly affected, our findings, comprehensively viewed, suggest that the calls have had a positive spillover effect on the dynamic behavior of price formation in NASDAQ's continuous market.
Stock Market Volatility in Indian Stock Exchanges
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The effects of trading activity on market volatility
The European Journal of Finance, 2000
Th e pap er re-exa mine s t he q uestion of exc essive imp lied persis tence of vo latility est imates wh en GARCH-type mod els are us ed. Te n actively t raded US st oc ks are consid ered and as already estab lished in the lit er ature, when volu me tr ad ed is inser t ed in th e GARCH(1,1) or EGARCH(1,1) mod els for retur ns , th e estimated p er sis tence is d ecreased. Sin ce vo lume is affected als o b y with in-th e-day p rice movements and hence is not weakly exo genous relative to returns, alternative proxie s for t rading activit ies are suggested. It is concluded th at the d ifference between th e opening p r ice and t he clos ing p rice of t he p revio us day accounts als o for mos t of th e persis tence in th e autoregressive cond itional h eteroske d asticity.
Impact on Indian Stock Market Volatility
Journal of emerging technologies and innovative research, 2019
The research focused on the volatility implications of the introduction of derivatives on stock market volatility in India using the S&P CNX Nifty Index as a benchmark. To account for non-constant error variance in the return series, a GARCH model is fitted by incorporating futures and options dummy variables in the conditional variance equation. The researcher find clustering and persistence of volatility before and after derivatives, while listing seems to have no stabilization or destabilization effects on market volatility. The postderivatives period shows that the sensitivity of the index returns to market returns and any day-of-the-week effects have disappeared. That is, the nature of the volatility patterns has altered during the post-derivatives period.