This is without theoretical justification, which points to expected returns in all stock markets being the same.

这种做法缺乏理论依据：所有股市的预期回报率理论上是一样的。

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The risk of stock market refers to the possibility of security value loss and the deviation of real earnings from expected returns, which can be both earning deviation and capital loss.

证券市场风险是证券价值遭到损失的可能，实际收益对期望收益的偏离，这既可以是收益的偏离也可以是资产的损失等。

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We also find that stock market returns and its volatility influence on trading volume mainly by impacting the expected volume.

其中股票收益率和收益率波动对交易量的影响主要是通过对预期交易量来起作用的。

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Though covered call writing is getting more attention as a way to generate returns when a stock isn't expected to rise very much, some investors don't realize that these returns aren't guaranteed.

FORBES: Intelligent Investing

They did not realise that people were living longer and investments in the stock market would not make the returns that had been expected.

BBC: The death of final salary pensions

The combination of tepid earnings reports received last week and once again mixed economic data in the form of the October Employment Report and weaker than expected factory orders for October resulted in mixed returns for the stock market last week.

FORBES: Move up http://i.forbesimg.com t Move down