A study of Chinese market efficiency, Shanghai versus Shenzhen: Evidence based on multifractional models Pierre R. Bertrand1, Marie-Eliette Dury2, and Bing Xiao3 1 Universit´eClermont Auvergne, CNRS, LAPSCO and LMBP, F-63000 Clermont-Ferrand, France
[email protected] 2 Universit´eClermont Auvergne, CNRS, CERDI, F-63000 Clermont-Ferrand, France
[email protected] 3 Universit´eClermont Auvergne, IUT Aurillac, CLERMA EA 38 49, France
[email protected] Abstract. The Chinese equity market is one of the emerging equity markets which offers an opportunity for international diversification, as a emerging markets, the Chinese stock markets are not mature. Since the 1990s, the reforms in regulations as well as in the attitudes of regulators have rendered the stock market more efficient. The progressive reform process of the stock market has improved the functioning of capital mar- kets and implemented market-based mechanisms. China's stocks pricing mechanism has been pushed toward a more market-oriented approach, in such cases, we expect an alteration in anomalies in the Chinese stock market. In this paper, we examine the daily data from the Shanghai A- share market, and Shenzhen A-share market over the 2006-2019 period. It would seem that in the Chinese stock market, the seasonal anomalies persist. But at the same time, by employing the Hurst exponent analysis, we find that the Chinese stock markets had a trend of becoming more and more efficient after the reform in October 2011. Keywords. Stock markets, Seasonal anomalies, Efficient market hypoth- esis, Hurst exponent, Multifractional Brownian motion. M.S.C. classification.