Asymmetries in stock markets

This paper analyzes three major asymmetries in stock markets, namely, asymmetry in return reversals, asymmetry in return persistency and asymmetry in return volatilities. It argues for a case of return persistency as stock returns do not always reverse, in theory and in practice. Patterns in return-volatility asymmetries are conjectured and investigated jointly, under different stock market conditions. Results from modeling the world's major stock return indexes render support to the propositions of the paper. Return reversal asymmetry is illusionary arising from ambiguous parameter estimations and deluding interpretations of parameter signs. Asymmetry in return persistency, still weak though, is more prevalent.