A market anomaly (or inefficiency) is a price and/or return distortion on a financial market. It is usually related to:
- either structural factors (unfair competition, lack of market transparency, ...)
- or behavioral biases by economic agents (see behavioral economics)
It sometimes refers to phenomena contradicting the efficient market hypothesis. There are anomalies in relation to the economic fundamentals of the equity, technical trading rules, and economic calendar events. See also efficient market
