Market Development, Information Diffusion and the Global Anomaly Puzzle

Charlie Xiaowu Cai, Kevin Keasey, Peng Li, and Qi Zhang

Previous literature finds anomalies are at least as prevalent in developed markets as in emerging markets, namely, the global anomaly puzzle. We show that while market development and information diffusion are linearly related, information diffusion has a nonlinear impact on anomalies. This is consistent with theoretical developments concerning the process of information diffusion. In extremely low efficiency regimes, without newswatchers sowing the seeds of price discovery and ensuring the long-run convergence of price to fundamentals, initial mispricing and subsequent correction will not occur. The concentration of emerging countries in low efficiency regimes provides an explanation to the puzzle.