This paper provides evidence of the effect of algorithmic trading (AT) in the liquidity of the Brazilian equity market. A wide debate on the literature asserts that AT may be both beneficial and harmful to market quality. The results of our econometric estimates for a sample of 47 stocks through...

It is often argued that intraday returns can be used to construct covariance estimates that are more accurate than those based on daily returns. However, it is still unclear whether high frequency data provide more precise covariance estimates in markets more contaminated from microstructure...