Aim/purpose - The aim of this paper is to verify whether extremely high values of market value ratios are the symptoms of informational inefficiency of the market in a weak form. The authors intend to examine whether these phenomena co-occur with each other. Design/methodology/approach -...

Do equity prices efficiently reflect fundamental information as the Efficient Markets Hypothesis suggests? The author challenges a widely held acceptance by financial academicians of the EMH. In a frictionless environment, information acquisition and trading would be costless, transaction prices...

The present study contributes to the ongoing debate on possible costs and benefits of insider trading. We present a novel call auction model with insider information. Our model predicts that more insider information improves informational efficiency of prices, but this comes at the expense of...

The finance industry has grown. Financial markets have become more liquid. Information technology has improved. But have prices become more informative? Using stock and bond prices to forecast earnings, we find that the information content of market prices has not increased since 1960. The...

This paper analyzes the impact of both penal law and prosecution of insider trading on the informational efficiency of securities markets. We show that increasing the severity of penalties to insider trading as well as making insider prosecution more efficient might improve the price discovery...

This study investigates the impact of foreign investors on the informational efficiency of stock prices in local markets. Using a large sample of Japanese firms over the period 1975 to 2008, we find that prices deviate less from a random walk for stocks with a large change in foreign ownership....

We model financial innovations such as Exchange-Traded Funds, smart beta products, and many index-based vehicles as composite securities that facilitate trading common factors in assets' liquidation values. Through accessing a larger basket of assets in endogenously-chosen proportions, composite...

BitMEX is the largest unregulated bitcoin derivatives exchange, listing contracts suitable for leverage trading and hedging. Using minute-by-minute data, we examine its price discovery and hedging effectiveness. We find that BitMEX derivatives lead prices on major bitcoin spot exchanges. Bid-ask...

Market integration and informational efficiency of stock markets are key policy variables, yet have long been studied as separate concepts. In this article, we address the forthright question of whether a more integrated stock market is also a more informationally efficient market using a panel...