Mean reversion in a price-earnings ratio and under / overvaluation in the Brazilian stock market

Abstract

The market price-earnings ratios differ from those of each share. Despite allowing for several pertinent analyses, authors have rarely addressed these valuation ratios in the Brazilian context. We can use it to evaluate whether the stock market is overvalued (undervalued). In this article, we analyze the mean reversion in a price-earnings ratio based on Ibovespa and identify periods of overvaluation (undervaluation) in the Brazilian stock market. We considered the period from December 2004 to June 2018. Until then, there are no studies that sought to identify periods of overvaluation (undervaluation) in this market. In the analyses, we used non-linear econometric methods. We analyzed the mean reversion in the price-earnings ratio using a unit root test that incorporates a Fourier function in the deterministic term. We identified the periods of market overvaluation (undervaluation) through the regime probabilities obtained from a Markov Switching model, estimated with the price-earnings ratio. The results evidenced that the price-earnings ratio based on the Ibovespa has a non-linear trend and exhibits mean reversion. Thus, this valuation ratio should provide information on the future stock market returns, mostly when it is very dispersed in relation to historical standards. We identified four periods of market overvaluation interposed with five periods of market undervaluation. Mean reversion in the price-earnings ratio contraposes the Efficient Markets Hypothesis. There are no other applications of unit root tests with a Fourier function in the Brazilian context. Furthermore, adopting a Markov Switching model to identify periods of market overvaluation (undervaluation) consists of a methodological contribution. Investors can take advantage of the identification of these periods to establish investment strategies.

An Entropic Approach for Pair Trading in PSX

“…The firms’ selection criterion was based on year-wise price earnings ratios (PER); a firm with a PER lower than the sample median value was selected in the sample. The underlying idea is that the stock below the median PER is undervalued and signifies potential for higher returns [ 21 , 22 ]. The choice of pairs was made through Johansen cointegration, which is the most effective way to identify stocks that move together [ 15 ].…”

The impact of live streaming on stock returns in the Brazilian market

“…Finally, the Ibov regressor provides an important finding for the literature, showing that online events with the participation of companies not belonging to the main reference portfolio of the Brazilian capital market, the Ibovespa, are more likely to provide statistically relevant abnormal returns than events with the participation of companies belonging to the index. Under the idea of efficient markets, the disclosure literature assumes that information, once disclosed, will be readily available to all investors, but this premise is not necessarily true and prevalent in all markets, especially in Brazil, according to the evidence pointed out by Amorim and Camargos (2021) and Camargos and Barbosa (2010), and until recently, companies with low media and analyst coverage were unable to reach investors without going through intermediaries. Thus, the evidence suggests that live streaming can be a particularly interesting platform for companies with low coverage to disclose earnings, which reinforces the findings of the literature on social networks and their effects on shareholder coverage (Alexander & Gentry, 2014;Blankespoor et al, 2014;Bushee et al, 2010;Miller & Skinner, 2015).…”