Can learning affect the effectiveness of price limits?

Purpose – The purpose of this paper is to investigate the market reaction to the decision made by the management of the Karachi Stock Exchange (KSE) to impose a price floor that resulted in trading curbs in 2008. The paper analyzes if regulatory intervention helped in restoring investor confidence. Design/methodology/approach – The paper examines the effect of enforcement of a price floor and trading curbs by splitting the time period studied into two periods: pre-floor and post-floor period. The parametric t-statistics and non-parametric Mann-Whitney test are used to compare the abnormal returns (ARs), abnormal trading volume, bid-ask spread, Amihud illiquidity ratio, and price volatility between the two periods. Event study was conducted to observe the behavior of market returns surrounding market-wide price floor. Finally, multivariate regression analysis was also applied by controlling for factors that might influence valuation, liquidity, and volatility. The standard errors have been corrected for cross-sectional clustering due to market-wide restrictions. Findings – The study found an adverse impact of price freeze and trading curb in the KSE, following the relaxation of floor (resumption of active trading). First, the price of securities (or ARs) significantly declined following the relaxation of the price freeze. Second, the market liquidity deteriorated following the relaxation of the price floor. Third, the price volatility increased in the post-floor period. It seems that the decision made by the KSE’s board to implement lower cap on prices for an extended period was ineffective. Practical implications – Market intervention by regulators to bring calm in the financial markets have negative consequences across the globe. The results presented in this paper suggest that implementing price floor brought inefficiency in the market and prevented firms from raising capital to finance their future investments. The author believe this study will add to the knowledge base of regulatory intervention and its impact on the performance of financial markets. Originality/value – There is no empirical evidence on the impact of price limits on volatility in emerging markets. The author selected Pakistan as a case study, where we particularly focus upon impact of the enforcement of a price floor around the peak of Global Financial Crisis (or market intervention) in Pakistan. This study also documents the effect of trading curb on liquidity and volatility in an emerging market, given that a majority of research on trading halt/price limits is based on developed markets.

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