Market Efficiency in Brazil: some evidence from high-frequency data

Alexandre Carvalho, Alberto Suen and Felippe Gallo

No 431, Working Papers Series from Central Bank of Brazil, Research Department

Abstract: In this paper we used intraday data to assess market efficiency in Brazil. We used a database of prices and the number of shares traded of liquid stocks listed in Brazil’s stock exchange, BM&FBOVESPA, and disclosures of material facts legally imposed by the Comissão de Valores Mobiliários (CVM), the Brazilian authority for the regulation of security markets. Our findings indicate material facts reported by firms indeed reveal unexpected information to investors. The speed of price response to new information and the observed magnitudes of cumulative returns indicate market participants can benefit from profit opportunities in the minutes close to the release of material facts. Our findings suggest stock prices take up to fifty minutes to incorporate the new information.

Date: 2016-05
New Economics Papers: this item is included in nep-mst
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.bcb.gov.br/content/publicacoes/WorkingPaperSeries/wps431.pdf (application/pdf)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:bcb:wpaper:431

Access Statistics for this paper

More papers in Working Papers Series from Central Bank of Brazil, Research Department
Bibliographic data for series maintained by Rodrigo Barbone Gonzalez ().