preview

Market Efficiency Tests: Five Anomalies Exist in Both Us and Australian Markets

Decent Essays

Executive summary
Market efficiency tests include weak, semi-strong and strong three forms. They assume that financial markets are "informationally efficient", or that prices of trading assets, already reflect all known information and therefore are unbiased in the sense that they reflect the collective beliefs of all investors about future prospects. The weak form test is based on the past information and public available information for semi-strong while strong form covers not only the public but also the private information.

Five market anomalies that appeared in U.S. and Australian equity market are discussed. They are Book-to-market ratio, January effect, small firm effect, weekend and temperature effect. The small firm effect …show more content…

This overreaction will initially leads to momentum effect in the short term. Then it will be followed by revert effect of negative serial correlation over the longer horizons.
Unfortunately, this is a difficult rule to trade on with any confidence, since the cycles are so long. In fact, they are as long as the patterns conjectured by Charles Henry Dow some 100 years ago. Does this all lend credence to the chartists, who look of for cryptic patterns in security prices – perhaps. But in all likelihood there is no easy money in charting, either. Prices for widely trades’ securities are pretty close to a random walk.
Thus, it suggests that although momentum exists in the short run there may be short lived patterns in price movement, they are unstable and inconsistence. In the long run, therefore, the best strategy to adopt is a buy and hold policy.
There are also several studies confirming that easily observable variables could determine the future market returns. Fama and French concluded that high dividend/price ratio results in high return on the stock market. Campbell and Shiller proved that earnings yield is one of the predictor of the market returns. Also, Keim and Stambaugh illustrated that spread between yields on high and low grade corporate bond can predict broad market returns.

Semi-strong form test
Secondly, semi-strong-form tests stated all publicly available information regarding the

Get Access