The effect of the introduction of market makers on stock liquidity: evidence from the Brazilian stock market

• Autor(a) principal: Carvalho, Gabriel Augusto de
• Data de Publicação: 2021
• Outros Autores: Ribeiro, João Eduardo, Correia, Laíse Ferraz
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Ambiente Contábil
• Texto Completo: https://periodicos.ufrn.br/ambiente/article/view/25722
• topic: Market Makers, Market Liquidity, Capital Markets.; Inglês.; Formadores de mercado, Liquidez de mercado, Mercados de capitales.; Market Makers, Liquidez de Mercado, Mercado de Capitais.

Purpose: This study aimed to analyze whether the introduction of market makers as specialized intermediaries in the trading of stocks listed on the Brazilian stock exchange is a useful procedure for increasing the market liquidity of these assets. Methodology: The Chow structural break test was performed in the time series of the liquidity proxies, average spread, turnover ratio, and financial volume on a sample of 55 stocks. We chose to consider data in the window of 260 days before and after the start of the market maker's activity, because it represents the approximate number of trading sessions in a year, and to avoid erroneous conclusions due to the volatility of the Brazilian stock market. Results: The results showed with a 99% confidence level that after the introduction of market makers, (i) 67% of the stocks analyzed had abrupt and statistically significant changes in the average spread; (ii) 47% in the turnover ratio; and (iii) 60% had changes in the volume transactions. At the confidence level of 95%, (i) 76% of the stocks analyzed showed abrupt changes in the average spread; (ii) 65% had changes in turnover; (iii) and 69% had changes in the trading volume. Using a lower confidence level of 90%, the results revealed 85% of the stocks had abrupt and statistically significant changes in the average spread, 78% in the turnover ratio, and 73% in the trading volume. Contributions of the Study: This paper provides strong evidence on the performance of market makers and the influence they have on the market liquidity of stocks traded on the Brazilian stock exchange. We found that contracting market makers increase market liquidity and contribute significantly to the assets’ transactions.