Maria V. Kulikova , David R. Taylor , Gennady Yu. Kulikov
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This paper investigates a time-varying version of weak-form market efficiency in the BRICS countries. A moving window test for sample autocorrelations is applied alongside a Kalman filter approach to recover the hidden dynamics of the market efficiency process through appropriate time-varying autoregressive models with both homoscedastic and heteroscedastic conditional variance. Monthly data cover the period from January 1995 to December 2020, which includes the 2008–2009 global financial crisis and the recent COVID-19 recession. The results reveal that all the BRICS stock markets were affected during both periods, but generally remained weak-form efficient, with the exception of China.
期刊介绍：
Economic Systems is a refereed journal for the analysis of causes and consequences of the significant institutional variety prevailing among developed, developing, and emerging economies, as well as attempts at and proposals for their reform. The journal is open to micro and macro contributions, theoretical as well as empirical, the latter to analyze related topics against the background of country or region-specific experiences. In this respect, Economic Systems retains its long standing interest in the emerging economies of Central and Eastern Europe and other former transition economies, but also encourages contributions that cover any part of the world, including Asia, Latin America, the Middle East, or Africa.
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