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

Submitted by Elba Lopes (elba.lopes@fecap.br) on 2016-01-27T18:34:52Z No. of bitstreams: 2 Carlos_Henrique_Pilleggi_Cotrim.pdf: 10713733 bytes, checksum: 45d575515233c4b974f51a451fce2dfd (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2016-01-27T18:34:52Z (GMT). No. of bitstreams: 2 Carlos_Henrique_Pilleggi_Cotrim.pdf: 10713733 bytes, checksum: 45d575515233c4b974f51a451fce2dfd (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2012-03-29 / The participation of individual investors in the Brazilian capital market increased about 85,000 in 2002 to over 600,000 in 2011. The BMF&BOVESPA has the goal to reach about 5 million individual investors by the end of 2018 and in this context are inherent risks of investment in shares which the Brazilian investor is little used, due to the complexity of this market. As it is essential a careful evaluation of accounting and financial reporting and the prospects of the company to ensure the investors a most appropriate decision for their investments, this study aims to know the investor perception, as a user, about the understandability of accounting and financial reporting, of publicly traded companies listed on BMF&BOVESPA, investigating possible explanations and comparing user perceptions individual investors to other groups involved. From retrospective studies on accounting and financial reporting, as well as general aspects of comprehensibility and language, was created an electronic research tool accessible via the internet. This instrument was made available to an estimated audience of about 14,600 people and had a return of 413 questionnaires of which 300 were validated. The sample had 97% of respondents with higher education and the results showed a high importance of accounting and financial reporting in decision-making investment in shares by the respondents. However, meeting the expectations related to the understandability of the reports had intermediate scores in most segments analyzed and found that the CLOZE test scores were low for most individual investors. The publicly traded companies, especially in the perception of individual investors, are not easily accessible, do not involve the public in the processes related to the development of accounting and financial reporting and does not seek to know your ideas. These results were in line with the perceptions on the availability of instruments segmented for specific audiences that proved to be low as evidenced by the preference of 81.3% of respondents that preferred separate reports, one conventional and one simplified, more accessible to the user less specialized. For the sample evaluated it is concluded from this study that there are opportunities to improve communication between public companies listed on BM&FBOVESPA and the segments of capital markets, involved in the accounting and financial reporting, from the use of plain language and objective to develop targeted instruments to specific audiences, by the companies that should be attentive to the preferences of investors. / A participa????o dos investidores pessoas f??sicas no mercado de capitais brasileiro mostrou-se crescente nos ??ltimos dez anos com evolu????o de cerca de 85 mil em 2002 para mais de 600 mil em 2011. A BM&FBOVESPA tem a meta de chegar a cerca de 5 milh??es de investidores pessoas f??sicas at?? o final de 2018 e nesse contexto est??o intr??nsecos os riscos do investimento em a????es aos quais o investidor brasileiro recente est?? pouco acostumado, em raz??o da com-plexidade desse mercado. Sendo indispens??vel uma avalia????o criteriosa dos relat??rios cont??-beis e financeiros e das perspectivas da empresa para se assegurar ao investidor uma decis??o mais adequada para seus investimentos, este trabalho tem como objetivo conhecer a percep????o dos usu??rios investidores sobre a compreensibilidade dos relat??rios cont??beis e financeiros, de companhias de capital aberto listadas na BM&FBOVESPA, investigando poss??veis fatores explicativos e comparando as percep????es do usu??rio investidor pessoa f??sica com a percep????o de outros grupos envolvidos. A partir do retrospecto de estudos sobre relat??rios cont??beis e financeiros, bem como de aspectos gerais sobre compreensibilidade e linguagem, foi criado um instrumento de pesquisa eletr??nico acess??vel por meio da internet. Esse instrumento foi disponibilizado a um p??blico estimado de cerca de 14.600 pessoas e teve um retorno de 413 question??rios dos quais foram validados 300. A amostra teve 97% dos participantes com n??vel superior e os resultados demonstraram alta import??ncia dos relat??rios cont??beis e financeiros no processo decis??rio de investimentos em a????es pelos respondentes. Entretanto, o atendimento das expectativas relacionadas ?? compreensibilidade desses relat??rios tiveram notas intermedi??rias na maioria dos segmentos analisados e o teste CLOZE verificou que a compreensibilidade foi baixa para a maioria dos respondentes investidores pessoas f??sicas. As companhias de capital aberto, principalmente na percep????o do investidor pessoa f??sica, n??o s??o de f??cil acesso, n??o envolvem esse p??blico nos processos relacionados ao desenvolvimento dos relat??rios cont??beis e financeiros e n??o buscam saber suas ideias. Esses resultados estavam alinhados ??s percep????es sobre a falta de oferta de instrumentos segmentados para p??blicos espec??ficos que se mostrou baixa, comprovada pela prefer??ncia de 81,3 % dos respondentes de que fossem apresentados relat??rios distintos, um convencional e outro simplificado, mais acess??vel ao usu??rio menos especializado. Conclui-se com este estudo, para a amostra avaliada, que h?? oportunidades de aprimoramento da comunica????o entre as companhias de capital aberto listadas na BM&FBOVESPA e os segmentos do mercado de capitais envolvidos com os relat??rios cont??beis e financeiros, com a utiliza????o de linguagem clara e objetiva at?? a cria????o de instrumentos segmentados para p??blicos espec??ficos, passando pelas companhias estarem atentas ??s prefer??ncias dos investidores.