**Preface to "Efficiency and Anomalies in Stock Markets"**

The Efficient Market Hypothesis believes that it is impossible for an investor to outperform the market because all available information is already built into stock prices. However, some anomalies could persist in stock markets, while some other anomalies could appear, disappear, and re-appear again without any warning. To explore new theories with applications in this direction, this Special Issue on "Efficiency and Anomalies in Stock Markets", edited by Wing-Keung Wong, is devoted to advancements in developing theories on market efficiency and anomalies in stock markets, as well as applications in market efficiency and financial anomalies in 2019. We invite investigators to submit manuscripts of original innovative research in theory, practice, and applications in the areas of market efficiency and anomalies in stock markets to be considered for publication in *Economies*. We are open to interesting and imaginative ideas that fit within the spirit and scope of the call for papers that should have a quantitative orientation.

> **Wing-Keung Wong** *Editor*
