Determinantes do bid-ask spread e efeitos dia-da-semana e fim-de-m??s na BOVESPA: um estudo emp??rico no per??odo de mar??o a dezembro de 2012

• Main Author: Oliveira, Marcelo Rodrigues de
• Other Authors: Yoshinaga, Claudia Emiko
• Format: Others
• Language: Portuguese
• Published: FECAP - Faculdade Escola de Com??rcio ??lvares Penteado 2015
• Subjects: Investimentos Processo decis??rio; A????es (Finan??as) Pre??os Dias da semana; A????es (Finan??as) Pre??os Oferta e procura; Bolsa de valores Brasil; Investiments - Decision making; Stocks - Days of the week; Stocks - Prices - Supply and demand; Stock exchanges - Brazil; CNPQ::CIENCIAS SOCIAIS APLICADAS::ADMINISTRACAO
• Online Access: http://132.0.0.61:8080/tede/handle/tede/401

Made available in DSpace on 2015-12-03T18:33:16Z (GMT). No. of bitstreams: 1 Marcelo_Rodrigues_de_Oliveira.pdf: 572879 bytes, checksum: 561a9772aa0bb467cfc2cb7f0721796f (MD5) Previous issue date: 2015-08-25 === Bid-ask spread is a key measure to evaluate the dynamics of stock prices. The literature show us that the main determinants of bid-ask spread are market capitalization, price level, price volatility and traded volume. Theories for bid-ask spread, discussed by Market Microstructure, define three reasons for their existence: (i) order processing costs; (ii) inventory control and (iii) information asymmetry. The information asymmetry, that is a key concept for the efficient market hypothesis, establishes the link between bid-ask spread and those factors that influence prices in a way not related to risk, which should be discussed by behavioral finance s perspective. The behavioral finance s literature searches for answers of questions in which stock prices does not reflect their values in a rational way. These situations are called market anomalies. Among the main anomalies, there are calendar anomalies, where it is possible to observe price behaviour related to moments of time, consistently. The objective of this study is to make a empirical and quantitative evaluation of the Day-of-Week Effect (DoW) on bid-ask spread of BOVESPA s stock prices. The work of Narayan, Mishra and Narayan (2014), about the relation between bid-ask spread determinants and Day-of-Week Effects, using NYSE stock data, found evidence of those effects, at first. Secondly, they found that bid-ask spread, stock price, traded volume and price volatility, in panel data setting are cointegrated and prices, volume and volatility have different effects in the bid-ask spread for each trading day. In this study, using BOVESPA data of 2012, from march to december, calendar anomalies are not confirmed in bid-ask spread. However, when we analized diary returns of stock prices, it was observed that Day-Of-Week and End-Of-Month effects were significant at 1% and Day-Of-Week effect is augmented in the period of end of month === O bid-ask spread ?? uma medida importante para a avalia????o da din??mica de pre??os de a????es. A literatura mostra que os seus principais determinantes s??o a capitaliza????o de mercado da empresa, o n??vel de pre??o da a????o, a volatilidade do pre??o da a????o e o volume negociado. As teorias para o bid-ask spread, tratadas pela Microestrutura de Mercado, definem tr??s raz??es para sua exist??ncia que s??o: (i) os custos de processamento das ordens; (ii) controle de invent??rio e (iii) assimetria informacional. A assimetria informacional, que ?? um conceito central na discuss??o sobre a efici??ncia dos mercados, estabelece a liga????o entre o bid-ask spread e os fatores que influenciam os pre??os de maneira n??o relacionada a riscos, os quais devem ser abordados sob o enfoque das finan??as comportamentais. A literatura de finan??as comportamentais aborda uma variedade de situa????es em que os pre??os de a????es n??o refletem de maneira racional o seu valor. Estas situa????es s??o chamadas de anomalias de mercado. Entre as principais anomalias, temos as anomalias de calend??rio, em que observamos o comportamento dos pre??os relacionado a um momento no tempo, de forma consistente. O objetivo deste estudo ?? avaliar, de maneira emp??rica e quantitativa, se existe o efeito dia-da-semana no bid-ask spread na Bovespa. O estudo de Narayan, Mishra e Narayan, de 2014, sobre a rela????o entre os determinantes do bid-ask spread e o efeito dia-da-semana para a bolsa de NY comprovou a exist??ncia do efeito dia-da-semana no bid-ask spread. Tamb??m teve como achados que o bid-ask spread, o pre??o da a????o, volume negociado e a volatilidade do pre??o da a????o, tomados em painel, s??o cointegrados e que o pre??o, o volume e a volatilidade tem efeitos diferentes no bid-ask spread nos diferentes dias de negocia????es. Neste estudo, com dados da bolsa de valores de S??o Paulo de Mar??o a Dezembro de 2012, n??o foram comprovadas as anomalias de calend??rio no bid-ask spread, por??m nos testes com retornos di??rios, observou-se que os efeitos dia-da-semana e fim-de-m??s s??o significantes a 1% e que o efeito dia-da-semana ?? mais pronunciado quando ocorre nos dias de fim do m??s